Question

3 boys and 4 girls can do a project in 7 days . 2 boys and 3 girls finish the same project in 10 days . if the project is given to single boy or single girl how many days does a boy or girl take to finish it​

Answer 1

Step-by-step explanation:

one boy and one girl takes 11 days to complete project

Answer 2

Answer:

4 girls do the work in 18 days. Or the work needs 72 girl-days. Each girl does (1/72)th of the work in a day. Hence 4 girls will do (4/72) or (1/18)th of the work in a day.

6 boys do the work in 18 days. Or the work needs 108 boy-days. Each boy does (1/108)th of the work in a day. Hence 3 boys will do (3/108) or (1/36)th of the work in a day.

So 4 girls and 3 boys do (1/18)+(1/36) = (2/36)+(1/36) = (3/36) = (1/12)th of the work in a day. Therefore, 4 girls and 3 boys will complete the work in 12 days.