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上星期五
问,总共治了多少次?
设被治1次:X只 被治2次:Y只
条件1: X+Y=90 总共治的次数是X+2Y,算不出 insufficient
条件2: 2/3( X+Y)= Y→2X-Y=0 算不出 X+2Y insufficient
条件1+条件2: 结合两个方程,可以算出X,Y,也可以算出X+2Y,sufficient
选C
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