Question

A,B can do a work in 25,20 days respectively. they work together for 5 days then A left. Then find out how many day6s required to complete the work when 18 persons can do 8 hours work.

Answer 1

Answer:

Answer

Let the total work be 1

Then, According to question X takes 25 days to do 1 work.

Then work done by X in 1 day=

25

1

Also according to question Y takes 20 days to do 1 work.

Then work doe by Y in 1 day=

20

1

Then total work done by both of them in 1 day =

20

1

+

25

1

=

100

9

Then total work done by both of them 5 days=

100

45

Then total work left =1−

100

45

=

100

55

Now, As Y can do 1 work in 25 days therefore,

Y can do

100

55

work in

100

55

×25 days

=

4

55

days