一个测试的问题总分为 100 分。有两种类型的问题，选择题每题 3 分，作文题每题 11 分。考试有多少道选择题?
(一) 12
(乙) 15
(三) 18
(四) 19答案：(乙)
说明：让我们考虑所有选择：
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] 这个问题的测验