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Last Friday each of the pets at a certain veterinary
(1) The total number of pets at the clinic last Friday was 90.
(2) 2/3 of the pets at the clinic last Friday were given 2 treats each.
A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.
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上星期五
問，總共治了多少次？
設(shè)被治1次：X只 被治2次：Y只
條件1： X+Y=90 總共治的次數(shù)是X+2Y，算不出 insufficient
條件2: 2/3（ X+Y)= Y→2X-Y=0 算不出 X+2Y insufficient
條件1+條件2： 結(jié)合兩個(gè)方程，可以算出X，Y，也可以算出X+2Y,sufficient
選C
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