Grace earns $7 for each car she washes. She always saves $25 for her weekly earnings. This week, she wants to have at least $65 in spending money. How many cars must wash?

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In order to figure out how many cars she must wash, first you should figure out how much money total you need.  This week, she needs $25 for her weekly earnings + $65 for spending money = $90.  Then you divide the total amount of money, $90, by 7.  The answer is 12.8, but because you can't wash 12.8 cars, the answer is 13.

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