7 men or 21 women can finish a piece of work in 20 days. How many women are required in place of 12 men to complete the same work?
Answer & explanation
Correct answer: option 1
7M or 21W can complete a work in 20 days i.e. same amount of work is done by 7M as done by 21W in same number of days .
so ratio of efficiency M : W
3 : 1
that means 1M = 3W
12M = 12 × 3W = 36W
So, 36 women can do same work as done by 12 men