265 of the veichles (cars and truck) on sale, 48% of the cars are4-door. 80% of the sale cars are 4-door. 问,有多少%的veichle是不是4-door的,完全没懂。我选了个20%。。。。答案有12%什么的。
我觉得选择12%。 20% of the sale cars are not 4-door。4-door与not 4-door为4:1 用比例相比的关系:因为(cars and truck) on sale, 48% of the cars are4-door. 所以not 4-door=48%*1/4=12%