Answer:
He drove 27 miles per gallon.
Explanation:
15 gas = 425 miles
gas = 425 miles
31 gas = 425 × 2
= 850 miles
1 gallon = 850 miles ÷ 31
1 gallon = 27 miles
Answer: If half a gallon is 15 then just multiply 15 with 2.
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