Afia can do her term paper in 15 days which takes Babul 20 days to finish, What is the fraction of work left if both Afia & Babul work together for 4 days?
সমাধান
সঠিক উত্তর: Option D
Afia, in 15 days does 1 work in 4 days does 4/15 work Bbul, in 20 days do 1 work in 4 days do 4/20 work both of them do together=(4/15+4/20)=7/15 part left=(1-7/15)=8/15
