原文题目：King School has an enrollment of 900 students. The school day consists of 6 class periods during which each class is taught by one teacher. There are 30 students per class. Each teacher teaches a class during 5 of the 6 class periods and has one class period free. No students have a free class period. How many teachers does the school have? 选项：
A、25 B、30 C、36 D、60 E、150
答案：C
When 29 of the votes on a certain resolution have been counted, 34 of those counted are in favor of the resolution. What fraction of the remaining votes must be against the resolution so that the total count will result in a vote of 2 to 1 against the resolution? 选项：
A、1114 B、1318 C、47 D、37 E、314
When 29 of the votes on a certain resolution h ...
这种题目，如果怕分数的计算过程容易出错，可以代数字嘛。
假设一共有18个人
When 2/9 of the votes on a certain resolution have been counted这句话就变成了：已经算了18*（2/9）=4个人的票
3/4 of those counted are in favor of the resolution.这句话就变成了：已经算了的4个人里，3人支持，1人反对
到这里，18个人还剩14个没计算票数，为了使最终反对人数/支持人数=2/1。很容易可以算出来（设个X列一元一次方程），剩下的14个人，需要有11人反对，3人支持。
So...答案是A。。。
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发表于 2019-10-24 16:24:18
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