GMAT
题目
At Tyler High School, there are twice as many girls than boys on the yearbook staff. At one staff meeting, the percentage of girls attending was twice the percentage of boys. What percent of those attending were boys?
解析
假设男孩数为X，女孩数为2X。
会议上，设男孩数为b，女孩为g。那么，（g/2X）*100=2*（b/X）*100，g=4b。
那么，会议上的学生总数为g+b = 4b+b = 5b。
因此，男生人数为b，男生百分比为（b/5b）*100=20。
答案A！
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