假設(shè)有100只老鼠被用來做實驗,那么40只是公的,60只是母的.實驗過程中假設(shè)死了10只,那么3只是公的,7只是母的.題目問：公的死亡率和母的死亡率之比是多少?
=3/40:7/60
=180:280
=9:14
所以正確的是A.9/14
求解一道GMAT題!
求解一道GMAT題!
forty percent of the rats included in an experiment were male rats.If some of the rats died during the experiment and 30 percent of the rats that died were male rats,what was the ratio of the death rate among the male rats to the death rate among the female rats?
A,9/14
B.3/4
C.9/11
D.6/7
E.7/8
forty percent of the rats included in an experiment were male rats.If some of the rats died during the experiment and 30 percent of the rats that died were male rats,what was the ratio of the death rate among the male rats to the death rate among the female rats?
A,9/14
B.3/4
C.9/11
D.6/7
E.7/8
英語人氣：132 ℃時間：2020-06-08 17:08:37
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