Question

Topic : Direct and indirect variations

Sohail can a piece of work in 15 days and sundar can do the same piece of work in 20 days. if they work on it together for 4 days , then what fraction of the work will left to complete.

Answer 1

Answer:

The answer of the following question is 8/15 part.

Step-by-step explanation:

Let,

The whole work is 1 part.

Sohail alone,

In 15 days can do 1 part of work.

In 1 day can do 1/15 part of work.

Again, Sundar alone,

In 20 days can do 1 part of work.

In 1 day can do 1/20 part of work.

Therefore, In 1 day, they together can do 1/15+1/20 part or, 7/60 part of work.

In 1 day, they together can do 7/60 part of work.

In 4 days, they together can do (7/60)×4 part or, 7/15 part of work.

Therefore, (1-7/15) part or, 8/15 part of work will be left to complete. (Answer)