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Below is a function box that adds 7 to any number that passes through it. If you enter 5, then the number 12 comes out of the other end.
Example:
Find ?

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answer is B.

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Detailed Solution

The function box performs multiplication on the input to get the output. So to find the number multiplied with, we need to perform the inverse function, ie, division on the output.

12 / 4 = 3. Hence 3 is the number used by the function box for multiplication. 4 x 3 = 12.

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