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题库 / GMATAdvanced-PS-16
A car traveled 462 miles per tankful of gasoline on the highway and 336 miles per tankful of gasoline in the city. If the car traveled 6 fewer miles per gallon in the city than on the highway, how many miles per gallon did the car travel in the city?
14
16
21
22
27
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设每箱有n加仑。462/n-336/n=6, n=21
每加仑的公里数=每箱的公里数/每箱的加仑数=336/21=16
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