Question

A can do a piece of work in 4 days and B can do the same work in 5 days, Find how much work can

be done by them working together in 2 days and what part of work still left.​

Answer 1

Step-by-step explanation:

in 1 day,A can do 1/4 part and B can do 1/5 part of the work.

then, A and B jointly can do { 1/4+1/5 } = 9/20 part in 1 day.

in 2 days, they can do (2×9/20)= 9/10 part of the work,and (1- 9/10)= 1/10 part is still left.