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26 October, 23:04

Mrs. lim is y year old. she was 25 year old when her son was born. Their total age in 12 years' time will be n years.

A) Express n in terms of y

B) Find n when y=38

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  1. 26 October, 23:10
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    let x be the age of her son

    y = 25 + x

    y - 25 = x

    (y + 12) + (x + 12) = n

    y + x + 24 = n

    y + y - 25 + 24 = n

    2y - 1 = n

    sub

    2 (38) - 1 = n

    n = 78
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