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ToolGuyd > Awesome & Cool > Fein Tools Math Riddle
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Fein Tools Math Riddle

Feb 21, 2019 Stuart 174 Comments

If you buy something through our links, ToolGuyd might earn an affiliate commission.

Fein USA Tools Math Puzzle Challenge

Fein US posted a math riddle to their Instagram channel, shown above.

So, what’s the answer?

Advertisement

They’ll reveal the correct answer tomorrow.

No, it’s not 42.

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174 Comments

  1. Marty says

    Feb 21, 2019 at 7:47 pm

    16

    Reply
    • John B says

      Feb 21, 2019 at 9:42 pm

      Agreed

      Reply
      • bjacob says

        Feb 22, 2019 at 8:53 am

        I agree with his agreement.

        Reply
        • bjacob says

          Feb 22, 2019 at 8:56 am

          No I don’t. I just realized the last one has multiplication. 60.

          Reply
          • Clifford Alloway says

            Feb 22, 2019 at 9:21 am

            I had to put my glasses on and when I did it looks that 60 is correct…

        • fred says

          Feb 22, 2019 at 9:15 am

          If you consider:

          A= tool
          B= battery
          C= blade

          3A=30 or A=10
          1A+2B=20 so B=5
          1B+4C=9 so C=1

          A+B+C = 5+1+10 = 16

          But if you consider the tool as having a battery that is considered separately – then the equations look like this:

          3(A+B) =30
          1(A+B) +2B = 20
          B+4C = 9

          so from the first equation A=10-B
          substituting into the second equation:
          10-B+B+2B= 20 or B = 10 and then A =0
          Then if 10+4C=9 = C= -0.25
          So in this scenario
          10 + 0 +(-0.25) = 9.75

          Reply
          • fred says

            Feb 22, 2019 at 9:22 am

            Forget what I wrote above

            Should have looked at the last line with multiplication sign.

            Case 1 >> B + C x A = 5+1 x 6 = 60

            Case 2 >> 10 + 0.25 x 0 = 0

          • fred says

            Feb 22, 2019 at 9:25 am

            Case 2 should have been >> 10.25 x (0+10) = 102.5

          • Stuart says

            Feb 22, 2019 at 9:55 am

            Since A + B is constant in all instances, appearing paired together, it can be considered a single variable, D.

            Whilst there is enough to solve for A, if you consider that the tool is described as A + B, you don’t need to.

            If you sub in B = 10 – A into the second equation, you get:

            A + 3B =20
            A + 30 – 3A = 20
            10 = 2A
            A = 5
            B = 5

            Same as if A+B = 10, or D = 10.

            Considering the bare tool as separate from the battery-equipped tool just makes more work.

      • bjacob says

        Feb 22, 2019 at 8:56 am

        No I don’t. I just realized the last one has multiplication. 60.

        Reply
    • MichaelHammer says

      Feb 21, 2019 at 10:14 pm

      17

      Reply
      • MichaelHammer says

        Feb 21, 2019 at 10:15 pm

        Dag! 25

        Reply
    • palm says

      Feb 22, 2019 at 9:57 am

      The answer is 15. Math order of operation. 10*1 +5.

      Reply
      • Wayne R. says

        Feb 24, 2019 at 12:26 pm

        You’re the first one (here, anyway) to get the math right. Winner! Of what, I don’t know, but your teachers should be proud too.

        Reply
    • jay dawes says

      Feb 22, 2019 at 6:04 pm

      17

      Reply
    • Johnny4 says

      Feb 23, 2019 at 9:25 am

      The problem included some observational and order of operations subtleties which can easily trip you up.

      List of incorrect answers and why:
      16 – did not notice the multiplication symbol
      25 – did not notice the single blade
      17 – missed both single blade and X
      60 – incorrect math adds before multiplying
      70 – incorrect math and missed the single blade

      Reply
    • Will says

      Feb 26, 2019 at 7:04 pm

      Yep,10 for the supercut,5 for a battery and one blade equals 1 so it’s 16.

      Reply
      • Johnny4 says

        Feb 27, 2019 at 9:20 pm

        Incredible. After all the explanations how can you possibly still think the answer is 16?

        Reply
  2. Brett says

    Feb 21, 2019 at 7:50 pm

    25

    Reply
    • Alexis says

      Feb 21, 2019 at 8:03 pm

      Seconded

      Reply
      • Alexis says

        Feb 21, 2019 at 8:05 pm

        Crap nevermind, I just saw what they did, the answer is 15.

        Reply
        • Mike says

          Feb 22, 2019 at 9:01 am

          Yeah i just saw that too. 15 gets my vote

          Reply
      • Jag Hundal says

        Feb 21, 2019 at 8:07 pm

        thirded

        Reply
        • Jag Hundal says

          Feb 21, 2019 at 8:07 pm

          i stick to 25

          Reply
          • Justin says

            Feb 21, 2019 at 8:19 pm

            Count the multitool blades.

      • Stacey says

        Feb 21, 2019 at 8:13 pm

        Yep

        Reply
        • Stacey says

          Feb 21, 2019 at 8:14 pm

          Definitely 25

          Reply
    • kdv says

      Feb 21, 2019 at 8:49 pm

      I’m going with 16 as well

      Reply
    • Grizz says

      Feb 22, 2019 at 12:57 pm

      25 is the correct answer. Order of operations is multiplication/division before addition/subtraction. The expression is 5 + (2 x 10).

      Reply
  3. Corey says

    Feb 21, 2019 at 7:51 pm

    17.

    Reply
    • Corey says

      Feb 21, 2019 at 7:53 pm

      Immediately realize that while I spotted the trick, I applied it wrong in my final step haha I rescind my previous answer and second Marty👍

      Reply
      • Corey says

        Feb 22, 2019 at 7:39 am

        And still messed up pemdas. Jesus, point taken, Stuart haha

        Reply
    • Ewoud says

      Feb 22, 2019 at 4:20 pm

      10+10+10 = 30
      10+5+5 =20
      5+2+2=9
      5+2=7 7×10 = 70

      Reply
  4. Leo Bauer says

    Feb 21, 2019 at 7:52 pm

    70

    Reply
  5. Struggleville says

    Feb 21, 2019 at 7:52 pm

    17. 100%

    Reply
    • Wayne says

      Feb 22, 2019 at 6:08 am

      There is a multiple, so 70

      Reply
      • Wayne says

        Feb 22, 2019 at 6:10 am

        Forgot order of operations lol
        Doh- 25

        Reply
    • Allen Wilson says

      Feb 25, 2019 at 9:08 am

      Hey guys, there’s only one correct answer. It’s all in the details and correct order of math.
      Look at the scrapers, it’s:
      2 scrapers + 2 scrapers = 4
      So:
      1 scraper = 1
      On the last line, multiplication trumps addition in the correct hierarchy of math operations. So, last line is:
      (5) + (1×10) = 15 Final answer

      Reply
  6. Harry says

    Feb 21, 2019 at 7:53 pm

    70

    Reply
  7. Matt S says

    Feb 21, 2019 at 7:53 pm

    15

    Reply
    • Matt S says

      Feb 21, 2019 at 7:57 pm

      10+10+10=30
      10+5+5=20
      5+2+2=9
      10+(1*5)=15

      Reply
      • csroc says

        Feb 21, 2019 at 9:02 pm

        Yep. Tricksy because I didn’t see the change in the number of blades on my phone screen without looking closely.

        Reply
      • Marty says

        Feb 21, 2019 at 10:39 pm

        Ooo didn’t notice the multiplication sign!!

        Reply
    • Austin S says

      Feb 22, 2019 at 11:36 am

      Agreed

      Reply
  8. Michael Polk says

    Feb 21, 2019 at 7:54 pm

    The correct answer is 15. I am sure a lot of you will come up with different answers but I will explain to you why this one is correct…tomorrow 🙂

    Reply
    • TonyT says

      Feb 21, 2019 at 8:05 pm

      Yup, that’s what I got…order of operations and count the number of multi-tool blades.

      Reply
  9. Davin says

    Feb 21, 2019 at 7:56 pm

    It’s 15 guys. Remember order of operations. (PEMDAS)

    Reply
    • CraftsmanForever says

      Feb 21, 2019 at 9:41 pm

      25 is the answer

      Reply
      • Ryan says

        Feb 22, 2019 at 1:24 pm

        Yep, $25. Multiply the 2×10 then add the 5.

        Reply
        • Ryan says

          Feb 22, 2019 at 1:26 pm

          My bad, didn’t notice there’s multiple blades stacked on line 3. Answer is 15.

          Reply
  10. Tom Magill says

    Feb 21, 2019 at 7:56 pm

    60

    Reply
    • sellers says

      Feb 22, 2019 at 1:13 am

      you are correct

      Reply
  11. Michael Polk says

    Feb 21, 2019 at 7:56 pm

    And too bad there is no prize lol

    Reply
    • Brien says

      Feb 21, 2019 at 9:00 pm

      15

      Reply
  12. Tom Magill says

    Feb 21, 2019 at 7:57 pm

    Ah… order of operators.

    Change mine to 15

    Reply
  13. Paul Dajewski says

    Feb 21, 2019 at 7:58 pm

    60

    Reply
  14. Luis says

    Feb 21, 2019 at 7:59 pm

    70

    Reply
  15. Josh says

    Feb 21, 2019 at 8:01 pm

    15

    Reply
  16. Willson says

    Feb 21, 2019 at 8:05 pm

    60

    And Bob’s your uncle.
    There is no spoon.
    The cake is a lie.

    Reply
  17. Craftsman forever says

    Feb 21, 2019 at 8:06 pm

    25 is the answer

    Reply
  18. Addison says

    Feb 21, 2019 at 8:13 pm

    It’s Fein so infinity! And the HSS cutter is dull.

    Reply
  19. Tim says

    Feb 21, 2019 at 8:25 pm

    60

    Reply
  20. Justin sherriff says

    Feb 21, 2019 at 8:26 pm

    10+10+10=30
    10+5+5= 20
    5+2+2= 9
    5+2=7×10= 70

    70

    Reply
    • Justin sherriff says

      Feb 21, 2019 at 8:35 pm

      60

      5+1×10=60
      4 blades on line 3 only 1 blade in the riddle

      Reply
      • BenV says

        Feb 21, 2019 at 9:17 pm

        15, the multiplication takes precedence over the addition…

        Reply
    • Noli says

      Feb 22, 2019 at 10:44 pm

      This guy gets riddles Answers 17 everyone

      Reply
      • Nol says

        Feb 22, 2019 at 10:48 pm

        Edit**
        It’s 60 ohh man now I’m confused.

        Reply
  21. Henry says

    Feb 21, 2019 at 8:34 pm

    The answer is 15

    Thank you Mr. Towne (my HS math teacher)!

    Reply
  22. Brian Harris says

    Feb 21, 2019 at 8:40 pm

    15

    Reply
  23. Don says

    Feb 21, 2019 at 8:54 pm

    17

    Reply
  24. Scott Davis says

    Feb 21, 2019 at 8:55 pm

    The answer is 15.

    Reply
    • Ryan Rich says

      Feb 22, 2019 at 9:47 am

      25.

      10×2 +5

      Reply
  25. Don says

    Feb 21, 2019 at 8:55 pm

    Oops 70. Missed the “x” on the last question

    Reply
  26. PHILIP JOHN says

    Feb 21, 2019 at 8:59 pm

    Its 15.

    It would only work out to 60 2 other ways… if it was dewalt or Milwaukee and then I would say give me 60 ( more better tool.)

    Reply
  27. Michael says

    Feb 21, 2019 at 9:14 pm

    60!!!!!!!!!

    Reply
  28. Brett says

    Feb 21, 2019 at 9:24 pm

    Had to go to the actual computer to see the number of blades everyone is talking about (tablet + old eyes = ahhhh crap I’m wrong….)

    10 + (1×5) = 16
    mumble mumble mumble
    🙂

    Reply
    • ChrisP says

      Feb 22, 2019 at 3:34 pm

      1×5=5. So
      10+(1×5)=15

      Reply
  29. Raoul says

    Feb 21, 2019 at 9:27 pm

    15

    Reply
  30. Brett says

    Feb 21, 2019 at 9:37 pm

    holy crap now I can’t even add when I can see LOL
    15

    Reply
  31. MacLean says

    Feb 21, 2019 at 9:46 pm

    60

    Reply
  32. Vards Uzvards says

    Feb 21, 2019 at 9:46 pm

    5+1+10=16

    Reply
  33. Vards Uzvards says

    Feb 21, 2019 at 9:48 pm

    Scratch the above! 🙂
    5+1×10=15
    Math is hard!

    Reply
  34. Scott K says

    Feb 21, 2019 at 10:22 pm

    15. PEMDAS + Pinch to Zoom for the win!

    Reply
  35. A W says

    Feb 21, 2019 at 10:26 pm

    15.

    Doubling the OMT blades is sneaky.

    Reply
  36. evadman says

    Feb 21, 2019 at 10:32 pm

    10+10+10=30
    10+5+5=20
    5+(1+1)+(1+1)=9
    5+(1*10)=15

    Reply
  37. Harry Klein says

    Feb 21, 2019 at 10:35 pm

    76

    Reply
  38. Darth says

    Feb 21, 2019 at 10:36 pm

    17

    Reply
    • Darth says

      Feb 21, 2019 at 10:39 pm

      Changing to 16 now that i see 2 blades on the 3rd line amd only 1 on the 4th.

      Reply
  39. Harry says

    Feb 21, 2019 at 10:38 pm

    650

    Reply
  40. Mike says

    Feb 21, 2019 at 10:55 pm

    The whole 2 blades vs 1 is kind of cheating on the trick. I never noticed till I saw someone mention in it and I zoomed in. Small detail on small screens like that is hard to see. 15, the order of operations trick gets people every time.

    Reply
  41. andy says

    Feb 21, 2019 at 11:10 pm

    The correct answer is in dollars, and the number is frighteningly high.

    Reply
    • Corey says

      Feb 22, 2019 at 7:14 am

      This may be the best answer lol

      Reply
  42. Johnny4 says

    Feb 21, 2019 at 11:44 pm

    All the incorrect answers after MattS explanation amuse me.

    Reply
  43. Louie Orama says

    Feb 22, 2019 at 12:05 am

    I’m going with 60 as well… First line tells you that the Oscillating Tool is 10. Second line tells you that the battery is 5. Third tells you that each blade is 1. So it is 5+1=6 x 10 = 60.

    Reply
    • Ryan says

      Feb 22, 2019 at 1:27 pm

      Multiply before dividing. It’s actually this: 5+(1×10)

      Reply
  44. Lukas says

    Feb 22, 2019 at 12:06 am

    15 if you do it the meme math way. I’m going to argue that there isn’t enough information. 3 equations with 4 unknowns. The single Fein and double Fein blades should be treated as separate variables. If I were to say that W=10 would you assume that V=5 just because a W looks like two Vs? Probably not.

    Reply
    • Alexis says

      Feb 22, 2019 at 8:16 am

      If W = 10 we have no way of knowing V, but one could make a strong argument for U = 5

      Reply
      • Lukas says

        Feb 22, 2019 at 8:28 am

        Well I’m just going by the appearance because that’s what we’re doing in this Fein riddle. I still don’t agree if we go by the name of the variable. Letters weren’t named with algebra in mind.

        Reply
  45. Adam says

    Feb 22, 2019 at 12:26 am

    15
    5+1*10. Multiplication always comes before addition unless there are parentheses. Therefore, 10*1=10, then 10+5=15

    Reply
  46. Kurt says

    Feb 22, 2019 at 12:37 am

    60

    Reply
  47. Brian A says

    Feb 22, 2019 at 12:45 am

    The answer is a lot of people are bad at basic math.

    Or if you’re smart enough to get the right answer (15) you are to smart to pay Fein prices.

    Reply
  48. Adam spiller says

    Feb 22, 2019 at 1:47 am

    The answer is 16

    Reply
  49. Altan says

    Feb 22, 2019 at 5:15 am

    Was it made in Germany also?!!!

    Reply
  50. Cary says

    Feb 22, 2019 at 5:50 am

    17

    Reply
  51. Rick H says

    Feb 22, 2019 at 6:36 am

    Answer is 70

    Reply
  52. Adam says

    Feb 22, 2019 at 6:55 am

    15

    Reply
  53. Higgo says

    Feb 22, 2019 at 7:12 am

    Wow! I would not let a majority of you do work on my house 🙂 Our contract would have to have a lot of verbiage re: who’s responsible for the cost of material shortages/overages.

    Reply
  54. Clint says

    Feb 22, 2019 at 7:32 am

    25

    5+(2*10)

    Reply
  55. Clint says

    Feb 22, 2019 at 7:34 am

    15

    Sorry, poor eyesight, did not see the bunched up blades.

    Reply
  56. Jerry says

    Feb 22, 2019 at 7:57 am

    15

    Reply
  57. OldDominionDIYer says

    Feb 22, 2019 at 8:00 am

    25
    5+2X10

    Reply
  58. OldDominionDIYer says

    Feb 22, 2019 at 8:03 am

    Oops there’s only 1 multi-tool blade in the last row so it would be:
    (1X10)+5=15

    Reply
  59. John Fleisher says

    Feb 22, 2019 at 8:52 am

    15

    Reply
  60. David C. says

    Feb 22, 2019 at 9:03 am

    17

    Reply
    • David C. says

      Feb 22, 2019 at 9:05 am

      Edit it is 25, didn’t notice the X in the last row.

      Reply
      • David C. says

        Feb 22, 2019 at 9:11 am

        Crap, it 15. Too hard to see the multiple blades on a phone.

        Reply
  61. Farid says

    Feb 22, 2019 at 9:40 am

    15. I assume 15% discount if you buy the combo shown.

    Reply
  62. Steve says

    Feb 22, 2019 at 9:49 am

    I’m with Rick H at 70

    Reply
    • Steve says

      Feb 22, 2019 at 9:51 am

      Ok, second try: 60

      Reply
  63. Craig says

    Feb 22, 2019 at 9:55 am

    17

    Reply
  64. Craig says

    Feb 22, 2019 at 10:01 am

    Sorry 70-Didn’t notice multiplication in last step

    3x = 30 so x = 10
    x + 2y = 20 so 10 + 2y = 20 so y = 5
    y + 2z = 9 so 2z= 4 so z = 2

    (y + z)x =70

    Reply
  65. John says

    Feb 22, 2019 at 10:19 am

    This is funny or sad, not sure which.
    America’s education system at its finest.
    Obeying the rules of mathematics,
    5 + (1 x 10) =
    15.

    As of 100+ comments roughly 1/4 of you gave the actual answer (not counting agreeing comments)

    Reply
    • Stuart says

      Feb 22, 2019 at 10:33 am

      Gradeschool math gets buried under decades of disuse.

      In high school and college-level math, habitual use of parentheses makes remembering PEMDAS redundant.

      The definition of the derivative is: limit as h-> 0 of ( f(x+h) – f(x) )/h. I had to look that up. I can tell you the derivative of ax^2 + bx + c, or other simplistic functions like that. But anything more advanced? Poof.

      Use it or lose it.

      How do you solve for x in a quadratic equation? Do you remember what y = ax^2 + bx + c looks like graphed out?
      y= mx + b. What’s m? What’s b?

      Use it or lose it. Nobody should feel bad about getting a different answer. Getting tricked by the multiplication sign or the number of accessories… that’s different. =P

      If you used control-F to count how many instances of “15,” a number of those are in x:15 timestamps.

      Reply
      • John says

        Feb 22, 2019 at 11:15 am

        True on the control-F, but the timestamps with 15 also get included. I see 32 answers with 15 as of this timeline but that still requires going through each of them to weed out other uses of 15 in the webpage. Ahh, how tools can help but also not help.

        As others have said the ‘x’ and single blade in the last equation tripped up a lot of people more than bad math.

        Reply
  66. Marcus says

    Feb 22, 2019 at 10:31 am

    15

    Reply
  67. David A. says

    Feb 22, 2019 at 10:43 am

    It’s 15.

    Lots of people initially missed the “x” in the last line on their first read-through and thought it was a “+” (I did), and lots of us missed the change in number of blades between the 3rd and 4th lines (I did too).

    Reply
  68. Robert says

    Feb 22, 2019 at 10:53 am

    5+ (2×10) = 25

    Far as I remember, you multiply whatever you can first, then you add.

    Reply
    • John says

      Feb 22, 2019 at 11:17 am

      Only a single blade in the last equation 😉

      Reply
      • Robert says

        Feb 22, 2019 at 11:47 am

        Huh, thought it was too easy. Sneaky.

        Reply
  69. Tyler says

    Feb 22, 2019 at 11:19 am

    25

    10+10+10 = 30
    10+5+5 = 20
    5+1+1+1+1= 9
    5+1×10 = 15

    Reply
    • Tyler says

      Feb 22, 2019 at 11:21 am

      Aaaand I typoed the first part of my answer.

      Reply
  70. G Greene says

    Feb 22, 2019 at 11:42 am

    15

    Reply
  71. JMG says

    Feb 22, 2019 at 11:46 am

    Quite the amusing post…

    I like the reference to the Hitchhiker’s Guide there.

    Reply
  72. Steve says

    Feb 22, 2019 at 11:47 am

    Dang, it’s sneaky. 55….look closely at pics and remember order of operations.

    Reply
    • Steve says

      Feb 22, 2019 at 11:49 am

      Wait….wrong! 15!

      Reply
  73. George Gallo says

    Feb 22, 2019 at 11:57 am

    70, no calculator needed

    A=10
    B=5
    C=2

    A+A+A = 30
    A+B+B = 20
    B+C (7)* A= 70

    Reply
  74. Dale Ianni says

    Feb 22, 2019 at 11:59 am

    15

    Reply
  75. Steve Newman says

    Feb 22, 2019 at 12:34 pm

    15 (multiplication before addition)

    Reply
  76. Trippy says

    Feb 22, 2019 at 1:04 pm

    60

    Reply
  77. Matt Shellito says

    Feb 22, 2019 at 1:15 pm

    Guys it is 15. (1×5)+10

    (1) blade =1 (1)battery=5 (1) tool=10

    Order of operation multiply divide add subtract.

    Come on my 3rd grade daughter just nailed this. I helped with what numbers should be where but she got the answer of 15.

    Reply
  78. John says

    Feb 22, 2019 at 1:47 pm

    I just have to say: With answers like that how did America develop as well as it did over the last 200 years ???

    16 is correct.

    One tool $10
    One battery $5
    One cutter $1

    Reply
    • Stuart says

      Feb 22, 2019 at 3:43 pm

      NOPE!

      Reply
  79. John says

    Feb 22, 2019 at 1:54 pm

    For practice answer this: If the electric locomotive is travelling North from NY, NY to Albany, NY at 60mph which way will the smoke blow?

    Reply
  80. al crespo says

    Feb 22, 2019 at 1:58 pm

    70

    Reply
  81. The What? says

    Feb 22, 2019 at 2:00 pm

    It’s either 15 or 60. If you go by order of mathematical operations you get 15. But there’s no mention of that applying to this equation. I got 2 different calculators that gave 2 different answers. So does this mean that I can buy 3 fein oscillators for $30? Or 1 oscillator and 2 batteries for $20? Is that what they’re putting down to pick up? Or is this some sort of bs that they’re trying pull?

    Reply
  82. The What? says

    Feb 22, 2019 at 2:10 pm

    I don’t mean to jump off topic, but has anyone ever heard of parkside tools. This LIDL store recently opened up the street, which I’ve never heard of, and they have Parkside power tools for unheard of prices.

    Reply
    • Raoul says

      Feb 23, 2019 at 11:15 am

      I’ve heard Lidl is coming and supposedly do what Aldi does but even better. Both are German I think. What town is it in?

      Reply
  83. Ben V says

    Feb 22, 2019 at 2:17 pm

    Computers never lie:

    ‘Maths.exe’ (CLR v4.0.30319: Maths.exe):

    a = 10
    b = 5
    c = 1

    a + a + a = 30
    a + b + b = 20
    b + (c*2) + (c*2) = 9

    b + c * a = 15

    Reply
  84. ca says

    Feb 22, 2019 at 2:18 pm

    I’m going with 9.

    Reply
  85. Corey says

    Feb 22, 2019 at 6:19 pm

    I screwed it up twice, early. And it’s making me feel less stupid reading all of the insistently wrong answers even after the entire thing has been explained multiple times. Read 10 comments and you’ll probably see the answer 15 explainy, so how is it still being argued against actually mathematics? It’s okay to be wrong, not so much fo be willingly and defensively wrong lol

    Reply
  86. steve says

    Feb 22, 2019 at 6:33 pm

    25

    Reply
  87. NCD says

    Feb 22, 2019 at 7:51 pm

    I think the answer is 600 , but I’m not sure. It’s either that or something else.

    Reply
    • Stuart says

      Feb 22, 2019 at 8:06 pm

      If you’re going to be wrong, better by a wild mile than a foot. =)

      Reply
      • NCD says

        Feb 22, 2019 at 8:45 pm

        I’ve been wrong before, honestly.lol

        Reply
  88. Patrick says

    Feb 22, 2019 at 7:53 pm

    I am saying 60.

    Reply
  89. Grady says

    Feb 22, 2019 at 8:18 pm

    60

    Reply
  90. Steve says

    Feb 22, 2019 at 9:38 pm

    Nothing Fein sells is cheap so I think a tool, battery, and blade is like $329 minus the charger for $263 divided by the percentage the marketer kicks in, times the square root of probability makes it about $764 . . . or maybe a little more.

    Reply
  91. Cody says

    Feb 22, 2019 at 9:51 pm

    Don’t over think it!!! SIXTY IS THE ANSWERC

    Reply
    • John says

      Feb 22, 2019 at 10:14 pm

      Thanks for playing but wrong.

      The correct answer of 15 has been said over and over and shown why it is correct many times (it’s called MATH), so how people keep coming up with wrong answers is mindblowing or mindnumbing.

      Reply
  92. glenn says

    Feb 23, 2019 at 2:22 am

    70.

    Reply
    • glenn says

      Feb 23, 2019 at 5:43 am

      Just rechecked, its 60.

      Reply
      • glenn says

        Feb 24, 2019 at 4:51 am

        Hmm. Just checked out the answer. Its been quite a while since I left school but I don’t recall being taught that the order of calculation is based on the assumption of brackets being there, where they are clearly not.

        Reply
        • Stuart says

          Feb 24, 2019 at 7:06 am

          You don’t remember PEMDAS, the order of operations rule?

          Please excuse my dear aunt sally.

          Parentheses
          Exponents
          Multiplication and division
          Addition and subtraction

          So if you have 1 + 2 x 3, the answer is 7, and not 9.

          In more elaborate math, there is greater care to adding parentheses. But in their absense, the order of operations is clear.

          Reply
          • glenn says

            Feb 24, 2019 at 3:41 pm

            I went to school in Australia so there is possibly a difference, but I genuinely don’t recall any rules that assume there are parentheses. I have always done calculations in order except when there are parentheses to indicate otherwise.

            However, its been 42 years since I left school, so I have forgotten a lot of stuff, lol.

          • Stuart says

            Feb 24, 2019 at 4:12 pm

            If it helps, Wikipedia says that in Australia you use: “BODMAS meaning Brackets, Order, Division/Multiplication, Addition/Subtraction.”

  93. ktash says

    Feb 23, 2019 at 2:46 pm

    Well, it’s 15. But hard to believe a Fein tool would be that cheap 😉

    Reply
  94. ChrisP says

    Feb 23, 2019 at 3:57 pm

    It’s 16,478,135,618.
    I enlarged the image and printed it out on 120 sheets of paper and the counted the pixels with a sharpie and an abacus. Sorry it has taken so long to give you the correct answer but my first attemp was rained out and I had to start from the beginnng.

    Reply
  95. Chip says

    Feb 23, 2019 at 5:55 pm

    I don’t have time to read the whole thread .
    I used a value of 5 for the battery ,and the tool..2 for multi blades.
    So 2 batteries 10p,1 tool 5p,+1p for single blade 5+5+5+1=16

    Reply
  96. Garrick says

    Feb 23, 2019 at 6:37 pm

    Assuming that Fein wants a numerical answer, I got 17 until I read that there was a Multiplier, then I got 70, until I read there was only one blade in the final equation, so I got 60, until read (and remembered) that multipliers are done before additions. then got 15. So I wrong, wrong, wrong, and then right.

    How come 2 wrongs don’t make a right… but, 3 lefts do?

    Reply
  97. Shawn says

    Feb 23, 2019 at 10:23 pm

    10+10+10=30
    10+5+5=20
    5+2+2=9
    5+1*10=15
    In the absence of parenthesis, multiply/divide first and then add/subtract.

    Reply
  98. Randy says

    Feb 24, 2019 at 1:16 am

    70.

    Reply
  99. Kevin says

    Feb 25, 2019 at 7:20 am

    70!

    Reply
  100. Kurt Fehrenbach says

    Feb 25, 2019 at 2:38 pm

    60

    Reply
  101. TcJ says

    Feb 25, 2019 at 4:27 pm

    It’s undefined. The number represented by two blades is 2; however, it’s not shown that the number represented by one blade is 1. You can assume that, but the math doesn’t show it.

    For example, the symbol “99” (two nines) does not represent a number that is twice as big as the number represented by the symbol “9” (one nine).

    Reply

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