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14 September, 20:25

Zack is 15 1/2 years old. This is 3 years younger than his brother Lou. How old is Lou

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  1. 14 September, 23:53
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    If you would like to know how old is Lou, you can calculate this using the following steps:

    Lou ... l years old = ?

    Zack ... z = 15 1/2 = 31/2 years old

    Zack is 3 years younger than Lou:

    z = l - 3

    15 1/2 = l - 3

    31/2 + 3 = l

    l = 31/2 + 6/2

    l = 37/2 = 18 1/2 years old

    Result: Lou is 18 1/2 years old.
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