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19 May, 04:31

The value of y varies jointly with the values of x and z. When x=4 and z=9, the value of y is 360. What is the value of y when x=5 and z=12?

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  1. 19 May, 04:42
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    Y = k * z, where k is any constant

    x=4, z=9, y=360

    360 = k (4) (9)

    360 = 36 k

    k = 360/36

    k = 10

    y = 10 * z

    when x=5 and z = 12

    y = 10 (5) (12)

    y = 600
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