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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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