15 men or 30 boys can finish a piece of work in 34 days. How many boys are required in place of 12 men to complete the same work?
Answer & explanation
Correct answer: option 1
15M or 30B can complete a work in 34 days i.e. same amount of work is done by 15M as done by 30B in same number of days .
so ratio of efficiency M : B
2 : 1
that means 1M = 2B
12M = 12 × 2B = 24B
so 24 boys can do same work as done by 12 men