Sixty percent of the rats included in an experiment were female rats. If some of the rats died during an experiment and 70 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?	Choose the correct choice from the following.
A) 7 : 2 B) 7 : 3 C) 2 : 7 D) 3 : 7 E) Cannot be determined from the information give
Let x be the total number of rats in the experiment.   Male = 0.4x   Female = 0.6x   Let a be the total number of rats that died during experiment.   Male = 0.7a   Female =0.3a   Death rates   Male = 0.7a/0.4x   Female = 0.3a/0.6x   Ratio of death rates among males and females = 0.7a/0.4x*0.6x/0.3a   =0.7/0.2   =7/2   7 : 2ns = 7 : 2
<result>A</result>
Sixty percent of the rats included in an experiment were female rats. If some of the rats died during an experiment and 70 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?