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By which number should be multiplied so that the product is the reciprocal of ?
Question

By which number should be multiplied so that the product is the reciprocal of ?

A.

-16/7

B.

-7/16

C.

16/7

D.

7/16

Correct option is D

x * (4/-1) = 1 / (4/-7)

-4x = -7/4

x = (-7/4) / (-4)

x = (-7/4) * (-1/4)x = 7/16

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