Q14: A total of 30 percent of the geese included in a certain migration study were male. If some of the geese migrated during the study and 20 percent of the migrating geese were male, what was the ratio of the migration rate for the male geese to the migration rate for the female geese? [Migration rate for geese of a certain sex = (number of geese of that sex migrating) / (total number of geese of that sex)]
A. 1/4 B. 7/12 C. 2/3 D. 7/8 E. 8/7
如题,真的没看懂。。。请高人帮我翻译成中文吧。。。谢谢。。。
增加一道: Q19: At a certain company, 25 percent of the employees are male and 50 percent of the employees are sales staff. What is the number of employees at this company? (1) Exactly 7 of the employees at the company are males who are sales staff. (2) There are 16 more female employees than male employees at the company. 像这种的题目我总是不会做。。。有没有好心人帮我开开窍啊?
[此贴子已经被作者于2009/9/21 22:21:22编辑过] |