GMAT
题目
A total of 120 investment advisors work at a particular financial services firm, 30 in bonds and the rest in equities. Fifty percent of the investment advisors are board-certified. If one third of the equities advisors are board-certified, how many bonds advisors are not board-certified?
解析
总数 = 120
债券顾问数 = 30
股票顾问数 = 90
持董事会认证的人数 = 120的50% = 60
持董事会认证的股票顾问数
= (1/3) × 90 = 30
=> 持董事会认证的债券顾问数 = 30
=> 持董事会认证的债券顾问数 = 30 - 30 = 0
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