王先生每天洗他的车。
加仑消耗除以洗的车量告诉他每洗一辆用了多少。
Gallons consumed divided by the number of cars washed told him how much of each solution was used per wash.
他承认豪华车开起来代价不菲，比如，需要两天就洗一次车，此外，每两天在排量六升的十二缸引擎需要花费一百二十块油钱。
He admits using a luxury car isn't all plain sailing- he has to clean it twice a day and the12 cylinder, six-litre engine guzzles an average of$120 worth of fuel every two days.
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