In a store, you can buy 5 apples for $7, how much do 9 apples cost?
Proportion: 5 apples is to $7 as 9 apples is to x.
5/7 = 9/x
5x = 7 * 9
5x = 63
x = 63/5
x = 12.6
The cost of 9 apples is $12.60
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