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15 June, 18:30

X : y = 5 : 3 and x + y = 56

work out the value of x - y

must show working

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  1. 15 June, 18:58
    0
    X : y = 5 : 3 and x + y = 56

    3x=5y and x + y = 56

    3x=5y and x=56-y

    3 (56-y) = 5y and x=56-y

    168-3y=5y and x=56-y

    168=8y and x=56-y

    y=168/8 and x=56-y

    y=21 and x=56-y

    y=21 and x=35

    x=35

    y=21
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