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Stuck trying to solve this question that popped up the other day. Spent the whole of the 15 minute test trying to find an answer to it. Iq question

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2 Answers 2

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The answer is

$2$

because

in each box, label the numbers like this:

A B
C D

Then $B * C = 10A + D$.

i.e. $3 * 6 = 18$, $7 * 8 = 56$, and $9 * 3 = 27$. So in the final box, we need a $2$ to complete the equation $5 * 4 = 20$.

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I hate this kind of puzzles, since the solution always feels kind of arbitrary to me. Just for the sake of it I suggest an alternative solution:

1

Reason:

The four boxes form a table with four rows and four columns. In each column, label the numbers like this: A B C D Then (A+B+C+D) mod 3 = 0

Now that I think about it, using the same argument, even

7

would be a solution. Depending on your creativity, it appears to me that any given number might be a solution to this problem.

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