Answer: 31/10 gallons of paint.
Explanation:
Find common denominators.
3/2 = 15/10
2/5 = 4/10
15/10 - 4/10 = 11/10
2 + 11/10 = 31/10
1 1/2 = 1 5/10
1 5/10 - 4/10 = 1 1/10
1 1/10 + 2 = 3 1/10
3 1/10 gallons of paint left
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