GMAT
题目
A certain truck uses 18 gallons of diesel fuel in traveling 270 miles. In order for the truck to travel the same distance using 10 gallons of diesel fuel, by how many miles per gallon must the truck’s fuel mileage be increased?
解析
当前燃油效率 = \( \frac{270}{18} \)英里/加仑 = 15英里/加仑
新燃油效率 = \( \frac{270}{10} \)英里/加仑 = 27英里/加仑
卡车的燃油效率需要提升的数值为：27 - 15 = 12英里/加仑
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