Question

Mohit can complete a work in 50 days, whereas Anuj can complete the same work in 40 days. Find:
work left after Mohit has worked on it for 20 days.

Answer 1

is given that

Mohit can complete a work in 50 days

Anuj can complete the same in 40 days

Mohit's one-day work = 1/50

Anuj's one-day work = 1/40

Work done by Mohit in 20 days $=\frac{1}{50}\times 20=\frac{2}{5}$

Work left after Mohit has worked on it for 20 days $=1-\frac{2}{5}=\frac{(5-2)}{5}=\frac{3}{5}$