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Puzzle ZWSM 



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What number replaces the question mark?

Puzzle Copyright © Kevin Stone

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Answer
4.

Reasoning
For each row, the left minus the right gives a number.

The numbers for the rows are then multiplied together.

In the first box:

   7 - 3 = 4
   4 - 1 = 3

so 4 x 3 = 12

In the second box:

   9 - 2 = 7
   8 - 3 = 5

so 7 x 5 = 35

In the last box:

   6 - 2 = 4
   8 - 7 = 1

so 4 x 1 = 4.

 

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