GATE | GATE-CS-2017(第2组)|问题1

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] 

这个问题的小测验

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