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2 August, 18:50

The variable z is directly proportional to x, and inversely proportional to y. When x is 11 and y is 14, z has the value 7.8571428571429. What is the value of z when x = 15, and y = 22

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  1. 2 August, 20:50
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    Z=kx/y

    7.9=k11/14

    Cross multiply

    K11=7.9x14

    K = 7.9x14/11

    K=10.1

    ...

    Z = kx15/22

    Z=10.1x15/12

    Z=12.625
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