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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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