问题
单项选择题
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 ？（）
A. 8
B. 9
C. 12
D. 15
E. 27
答案
参考答案：C
解析：
If the truck travels 270 miles on 18 gallons, it is getting 270/18=15 miles per gallon. To travel 270 miles on 10 gallons, it would need to get 27 miles per gallon. 27-15=12.