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6 November, 15:34

Mr. Lin is four times as old as his daughter. In 4 years he will be three times as old as his daughter. How she is his daughter now?

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  1. 6 November, 17:53
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    The present age of Mr. Lin's daughter = 8 years old.

    The present age of Mr. Lin = 32 years old

    Step-by-step explanation:

    Let the present age of Mr. Lin's daughter = x yrs old

    So, the present age of Mr. Lin = 4 times daughter's age = (4 x) yrs

    Now, age of daughter after 4 years = (x + 4) yrs

    and the age of Mr. Lin after 4 years = (4x + 4) years

    Also, (4x + 4) = 3 times (x+4)

    According to the question:

    4x + 4 = 3 (x+4)

    or, 4x + 4 = 3x + 12

    ⇒ 4x - 3x = 12 - 4

    or, x = 8

    Hence, the present age of Mr. Lin's daughter = 8 years old.

    and the present age of Mr. Lin = 4 x = 4 x 8 = 32 years old
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