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20 July, 11:41

If a varies directly as b, and a = 28 when b = 7, find b when a = 5.

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  1. 20 July, 13:15
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    If a varies directly as b:

    a = k b

    28 = 7 k

    k = 28 : 7 = 4

    When a = 5:

    5 = 4 b

    b = 5 : 4

    b = 1.25
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