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15 July, 23:29

S varies directly as T.

If S is 20 when T is 4, then T is a0 when S is 30

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  1. 15 July, 23:52
    0
    The answer is 6

    S varies directly as T: S = kT (k - constant)

    k = S/T

    k = S1/T1

    k = S2/T2

    So: S1/T1 = S2/T2

    S1 = 20

    T1 = 4

    S2 = 30

    T2 = ?

    20/4 = 30/T2

    5 = 30 / T2

    T2 = 30/5

    T2 = 6
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