Answer:
18 muffins and 12 pies
Explanation:
number of pies = x
number of muffins = 30-x
cost of pies = 4.5x
cost of muffins = 2.5(30-x)
4.5x - 2.5(30-x) = 9
4.5x - 75 + 2.5x = 9
7x = 84
x = 12
so he bought 12 pies and 18 muffins
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