Question

A completes 80% of a work in 20 days. Then b also joins and a and b together finish the remaining work in 3 days. How long does it need for b if he alone completes the work? *

Answer 1

Answer:

Step-by-step explanation:

let total work is 100 unit .

A can do 80 unit in 20 days ....so he can do 4 unit in 1 days .

now A has finished 80 units so remaining work is 20 unit

so , 20 unit work takes 3 days time to complete in which A will do 12 unit

(since A do 4 unit/days )

thus ,B do 8 unit in 3 days

and total work is 100 unit so B will take (3/8)*100 = 37.5 days to complete total work

Hope it helps you.....