Question

A is thrice as efficient as

b. working together they complete the work in 3 days. if b takes 8 days more than a, what is the number of days taken by a to finish the whole work, alone?

Answer 1

let a do 3x units per day and b do x units per day
togather they do 12x units in 3 days
now b will take 12 days to complete the work
and a will take 8 less i.e 4 days