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3 January, 13:41

Five years ago, Amy was three times as old as Mike. If Mike is 10 years old now, how old is Amy?

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  1. 3 January, 14:01
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    Amy is 20

    Explanation:

    Let Amy's age be A and Mike's age M

    Five years ago, A - 5 = 3 (M - 5)

    A - 5 = 3M - 15

    A = 3M - 15 + 5

    A = 3M - 10 (M = 10)

    A = 3 (10) - 10 = 30 - 10 = 20
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