Question

A and B can do a piece of work in 20 days and B in 15 days they work together for 2 days and then they go away in how many days will be finish the remaining work.


(Please give full solution)​

Answer 1

A and B do a work in 20 days

In other words, the fraction of work done by A and B in 1 day is 1/20

Similarly Fraction of work done by B in 1 day is 1/15

Now A and B work together for 2 days and completed 2/ 20 or 1/10 of work.

Work left is 1- 1/10 =9/10 which B has to do

1/15 of work is done by B in 1 day

So 9/10 of it is completed by B in

9*15/10

135/10=13.5days