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17-11-2016
Geography

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

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Аноним Аноним

17-11-2016

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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