Question

a man can do a piece of work in 5 days his son help him and the work completed in 3 days in how many days his son complete the work ?​

Answer 1

Answer:

one day work of man =1/5 and let one day work of his son be 1/x.then 1/5+1/x=1/3..

x+5/5x=1/3

3x+15=5x

2x=15

x=7.5 days