Problem of the Day
A new programming or logic puzzle every Mon-Fri

Hidden Math

A fun number riddle to end our week.

  • 3+3*4 = 28
  • 4+4*6 = 54
  • 5+5*7 = 77
  • 6+6*9 = ??

Permalink: http://problemotd.com/problem/hidden-math/

Comments:

  • Akshay Bist - 9 years, 9 months ago

    117?

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  • diopim - 9 years, 9 months ago

    ( 1 + (3 + 3)) * 4 = 28 ( 1 + (4 + 4)) * 6 = 54 ( 1 + (5 + 5)) * 7 = 77 ( 1 + (6 + 6)) * 9 = 117

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  • ineedit- - 9 years, 9 months ago

    ((3+3)(4))+4=28 ((4+4)(6))+6=54 ((5+5)(7))+7=77 ((6+6)(9))+9=117

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  • brix - 9 years, 9 months ago

    I believe that 117 is the answer. While the order of operations may be incorrect here, I found a pattern. So, 3+3 * 4 = 28. So 6 * 4 = 24 THEN + 4, which is the number that is being multiplied here equals 28.

    4+4 * 6 = 54. So 8 * 6 = 48 THEN + 6 (the number being multiplied is added).

    5+5*7 = 77, or 10*7 = 70 THEN + 7, the number being multiplied.

    Now, 6+6 * 9 = ?, so following the same pattern, 12 * 9 = 108 THEN + 9 is 117.

    I hope the formatting isnt atrocious. :)

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