Question

pls help me to solve this question ​

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

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Answer 2

Answer:

13.5 days

Step-by-step explanation:

both can do it in 20 days i.e. work done by both in one day is (1/20).

work done by both in 2 days is (2/20) i.e. (1/10).

the remaining work is (9/10).

b only can do the work in 15 days i.e. work done by b in one day is (1/15)

let us think that is x.

then,

x*(1/15)=(9/10)

x=((9*15)/(1*10))

x=(135/10)

x=13.5 days