A
Abc
17 May 19

Please provide steps

Replies to this post

E
Erfan
3
S
Sree

20% work in 3 days
So 100% work can be finished in 15 days.

80% of the work was completed by B in 20 days.
So he can do the 100% work in 25 days

       A+B       B
        15d    25d

LCM 75
So the efficiency of A and B is 5
Efficiency of B alone is 3.
From that, efficiency of A is 2.
Now the total work ÷ A's efficiency = 75÷2=37.5

2