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9 October, 07:19

Mary is 3 years older than Sarah. winifred is twice as old as Mary. Altogether thei ages total 89. How old is Sarah

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  1. 9 October, 10:39
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    sarah is 20 years old

    Step-by-step explanation:

    We will represent Mary as m, Sarah as s and wilfred as W

    so m = s+3, w = 2m

    and s + w + m = 89

    substitute m for s+3

    so

    w=2s + 6 and

    2s+3+w=89

    substitute w for 2s+6

    2s + 3 + 2s+6=89

    4s+9=89

    4s = 80

    s=20
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