Question

Shaily and Samta can complete a given work in 15 and 20 days respectively. If they work on it together for 4 days, then what fraction of the work is left ?

Answer 1

shaily and shamta works in 1 day = (1/15) + (1/20) = (4 + 3)/60 = 7/60

Their work in 4 days = (7/60) * 4 = 7/15

The total work is 1 , then the work left = 1 - (7/15) = 8/15