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by nlpfollower » Mon Mar 15, 2010 9:42 pm
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
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by koolk86 » Mon Mar 15, 2010 10:16 pm
Hi ,

Can you post the OA??
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by Phirozz » Mon Mar 15, 2010 10:29 pm
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
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by Phirozz » Mon Mar 15, 2010 10:30 pm
Phirozz wrote:
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
In exam, u should assume some figure for number of rats dies to make ur calculation easy
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by nlpfollower » Mon Mar 15, 2010 11:22 pm
OA is A. thanks guuys..
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by kstv » Mon Mar 15, 2010 11:50 pm
Male = 40 Female 60
Total Death = 10 x
male death = 3x/40
------------- ------------------------- = 9/14
female death 7x/60
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