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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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highway 一箱油跑462，city一箱油跑336
city比highway一加仑少跑6
462-336得出总共少跑126，126/6=21加仑，表示一箱油有21加仑
336/21=16得出city中每加仑跑21
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