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 ♦May 15 '19 at 19:07
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$\begingroup$ It's by my own devising. $\endgroup$– Stojan SamojlovskiMay 15 '19 at 20:00
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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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$\begingroup$ Yeah, that's the answer! Congrats! $\endgroup$ May 15 '19 at 19:16
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$\begingroup$ In other words, (ROT13) Gur guveq ahzore ba rnpu yvar rdhnyf gjb gvzrf gur frpbaq ahzore, zvahf gur svefg ahzore, zvahf bar, zbq gjryir, jvgu erfhygf enatvat sebz bar gb gjryir (v.r., mreb vf cebzbgrq gb gjryir).; i.e., (hover over this). $\endgroup$ Jun 13 '19 at 6:04