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答案：
C
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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