Sixty percent of the rats included in a particular experiment were female rats. If some of the rats died during the experiment and 30% of rats died were male, what was the ratio of the death rate among the male rats to the death rate among the female rats?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 9 : 14
Let x be total rats then,
Female rats = 60% of x = 0.6x
Male rats = 40% of x = 0.4x
Let A be the total number of rats that died during the experiment
male rats died during the experiment = 30% of A = 0.3A
Female rats died during the experiment = 70% of A = 0.7A
death rats of male rats and female rats are 0.3A/0.4x and 0.6A/0.7x respectively
required ratio = 0.3A/0.4x : 0.6A/0.7x = 9 : 14