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Saw this on the web somewhere...gave it a couple looks before an answer appeared. But it took a few more looks to determine that one answer wasn't exactly the limit to what we can juice out of this thing.

Rules:

  • Don't post the same answer as the person before you

    (So I guess that means for the first time ever, looking at somebody else's answer is more than encouraged :p )

  • The most impressive/most voted answer will be checkmarked

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closed as too broad by Deusovi Oct 16 '16 at 23:36

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ If you don't know the answer to your question, then you should state it in your post. Questions should be in general uniquely answerable, otherwise they tend to be too broad. $\endgroup$ – Matsmath Oct 16 '16 at 22:13
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    $\begingroup$ Considering that this question's sole purpose is to gather many answers, it is too broad. Puzzle questions should ideally have one answer. $\endgroup$ – Deusovi Oct 16 '16 at 23:37
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The answer should be

4

because

The numbers represent multiplication:

9 2 1 8 —> 9 * 2 = 18
6 4 2 4 —> 6 * 4 = 24
5 7 3 5 —> 5 * 7 = 35
8 8 6 ? —> 8 * 8 = 64


Testing more patterns

At first sight, you could also find that

9 2 1 8 —> 9 + 1 OR 8 + 2 = 10
6 4 2 4 —> 6 + 2 OR 4 + 4 = 8
5 7 3 5 —> 5 + 5 OR 7 + 3 = 10

but this is broken by the last line

8 8 6 ? —> 8 + 8 OR 8 + 6 don't give 10 or 8

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  • $\begingroup$ I was thinking a bit similar to you. But instead of adding. I subtracted 9 and 2, 1 and 8 which would be 7. 6 and 4, 4 and 2= 2. 5 and 7, 5 and 3= 2. 8 and 8, 6 and 6 = 0 $\endgroup$ – bill bsl Oct 16 '16 at 22:39
  • $\begingroup$ I was also thinking that if you started on the second horizontal row, subtracted 4 and 2, and added 6 and 4. 10 - 2 equals 8, which is present on the last box of the first horizontal row. Third row and fourth row is different. It's 7 subtracted to 3, and 5 subtracted to 5. 4 - 0 is 4. 4 is present on the last box of the second row. Fourth row is 8 subtracted to 6 is 2, 8 subtracted to 1 is 7. 7 subtracted to 2 is 5. 5 is present on the last box of the 3rd row $\endgroup$ – bill bsl Oct 16 '16 at 23:02

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