Question

Grace earns $7 for each car she washes. She always saves $21 of her weekly earnings. This week, she

wants to have at least $66 in spending money. How many cars must she wash?

Answer 1

Answer: 13

Explanation:

`66\geq 7x-21`

add 21 both sides

`87\geq 7x`

divide both sides by 7

`12.4\geq x`

So more than 13 cars