4
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Puzzle goes like:

3, 2, 12

10, 4, 9

8, 6, 3

9, 6, 2

7, 4, (?)

Can you answer what can be the (?) mark, with explanation

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  • $\begingroup$ Is this a puzzle of your own devising or does it come from somewhere else? $\endgroup$
    – Gareth McCaughan
    Commented May 15, 2019 at 19:07
  • $\begingroup$ It's by my own devising. $\endgroup$ Commented May 15, 2019 at 20:00

1 Answer 1

3
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My answer is

12

Reasoning:

Think about an analog clock:
3 - 2 -> 1 hour, 2 - 12 -> 2 hours
10 - 4 -> 6 hours, 4 - 9 -> 7 hours (continuing counterclockwise)
8 - 6 -> 2 hours, 6 - 3 -> 3 hours
9 - 6 -> 3 hours, 6 - 2 -> 4 hours
In each one the # of hours goes up by one, so:
7 - 4 -> 3 hours, 4 - 12 -> 4 hours

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