It takes 10 days for 4 boys to complete a piece of work. The same work can be completed by 7 girls in 10 days. If 3 boys and 5 girls work together, approximately how many days will they need to complete the work?

It takes 10 days for 4 boys to complete a piece of work. The same work can be completed by 7 girls in 10 days. If 3 boys and 5 girls work together, approximately how many days will they need to complete the work?

A 10

B 15

C 7

D none of these

Solution

Correct Answer: Option C