Question

Three men and six boys can do a piece of work in two days. A man can do the work in 5 days less time than a boy. How many days can a man take to do the entire work

Answer 1

3m + 6b = 2

So

6m + 12b = 1

And

A man takes X days

Boy takes X+5 days

6/m + 12/b = 1

6/x + 12/(x+5) = 1

After solving this you will get

X = 15 days