Question

Ram and Shyam can paint a house in 20 days. Ram alone can do do it in 30 days. In how many days can Shyam alone do it? ​

Answer 1

Answer:

Step-by-step explanation:

Ram and shyam  can do in 20 days together

Let Ram  can do the work in x days

1 work x days

1 day. 1/x work

Ram  works for 20 days with shyam

20 days. 20/x work

Let shyam can do the work in y days alone

1 work. y days

1 day. 1/y work

shyam works for 20 days with ram  

20 days. 20/y work

20/x + 20/y =1work

It is given Ram can do the work alone in 30 days

20/30 + 20/y = 1

20/y =1-20/30

20/y =10/30

20/y =1/3

y =60

In 60 days shyam can do it alone

Answer 2

Step-by-step explanation:

One day work of Ram and Shyam =1/20

One day work of Ram= 1/30

Therefore, One day work of Shyam= 1/20- 1/30

=1/60

Hence, Shyam can paint a house in 60 days.