nlpfollower wrote: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
IMO A
let say thr are 100 rats our of which 40 are male and 60 are female rats
Lets assume that 'x' rate died in experiment
30% of x is male and 70% of x is female
So 3x/10 are male and 7x/10 are female
Now to calculate death rate among male rates and female rats is
(3x*100/400)/7x*(100/600) ie 9/14
