-14
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Find the missing number in the following table.

5 17 9
3 21 7
7 16 8
6 10 ?

Answer Options:

  • 10
  • 12
  • 15
  • 16
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7
  • 3
    $\begingroup$ What is your source for this puzzle, or did you make it yourself? $\endgroup$ Commented Jun 21, 2017 at 13:45
  • $\begingroup$ Figured it out, but waiting for OP to answer before I post an answer. $\endgroup$ Commented Jun 21, 2017 at 13:47
  • $\begingroup$ @Randal'Thor I found it one of the old competitive exam papers, I am preparing for. $\endgroup$
    – Manny
    Commented Jun 22, 2017 at 9:48
  • $\begingroup$ @JohnClifford Answer is 16. I don't know how. That's y posted it here. $\endgroup$
    – Manny
    Commented Jun 22, 2017 at 9:49
  • $\begingroup$ You should probably include the source in the OP, I think it's being voted down because there's no indication of where it's from. I can't see any sequence that would result in it being 16, though... $\endgroup$ Commented Jun 23, 2017 at 9:53

1 Answer 1

5
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The answer is

15

because

each row adds up to 31.

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2
  • $\begingroup$ I found it in one of the old competitive exam papers, I am preparing for. Even I got 15. However, its mentioned to be 16 in the answer key. $\endgroup$
    – Manny
    Commented Jun 22, 2017 at 9:51
  • 1
    $\begingroup$ @MansiManhas Indian book writers and even the authorities conducting the aptitude exams for lower groups posts get the answers wrong a lot. Don't bother with official answer, but use logic. I saw 15 as answer in an another book. $\endgroup$
    – Firelord
    Commented Sep 7, 2017 at 21:25

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