Question

If A can complete a piece of worl in 25 days b can do a piece of work in 15 days. A and B work together 5 days.A leaves how work should be done by B​

Answer 1

Answer:

11

Step-by-step explanation:

A takes 25 days => A does 4parts/day

B takes 20 days => B does 5parts/day

(A+B) together do 9parts/day

In 5 days, work completed together = 45 parts

Remaining work = 55 parts

Now, A has left so remaining work will be done by B

Time Taken =555=11

Answer 2

Answer:

Step-by-step explanation:

work A can do in one day = 1/25

work B can do in one day = 1/15

so the work both can do in one day= 1/25 + 1/15 =8/75

so the work both can do in 5 days = 40/75= 8/17

so the work remaining = 9/17

so days needed by B to compelete the work = (9/17) / (1/15) = 9/17 * 15/1 =135/17 days

so B will take 7 and 16/17 days to compelete the work