一次考试的总成绩为100分。有两种类型的问题,选择题各得3分,作文题各得11分。这次考试有多少选择题? (A) 12 (B) 15 (C) 18 (D) 19 答复: (B) 说明: 让我们考虑所有的选择:
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Choice A : 12 [Wrong] There is no integer x that satisfies below equation 12 * 3 + x * 11 = 100 x = 64/11 [Which is not an integer] Choice B : 15 [Right] 15 * 3 + x * 11 = 100 x = 55/11 = 5 Choice C : 18 [Wrong] There is no integer x that satisfies below equation 18 * 3 + x * 11 = 100 x = 46/11 [Which is not an integer] Choice C : 19 [Wrong] There is no integer x that satisfies below equation 19 * 3 + x * 11 = 100 x = 43/11 [Which is not an integer]
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