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10 September, 07:34

Johnny is seven years older then his little sister. let j represent jonny's age and s represent his sister

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  1. 10 September, 08:50
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    Well to find this out you need to make an equation

    s+7=j

    So for example if Johnny's sister is 15 then Johnny would be 22 because

    s (sister's age) + 7 (number of years difference between their ages) = 22 (Johnny's age)
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