math
posted by lauren .
sonya spent 3/8 of her money and had $15 left. how much money did she orginally start with?

If Sonya spend 3/8 of her money, she has (13/8)=5/8 left.
Use proportions:
5/8 : $15
1 : $x
Use cross multiplication to get:
$x=$15*1÷(5/8)
=$15*(8/5)
=$24
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