# Find The Remaining Work ? If

A can do a work in 10 days and B in 20 days. If they together work on it for 5 days, then the fraction of the work that it left is:

- 1/4
- 3/4
- 3/20
- 4/3

**Answer: (1) 1 /4**

**Explanation:-**

A can do a work = 10 days

A can do work in a day = 1/10

B can do a work = 20 days

B can work in a day = 1/20

A and B together can work in a day = 1 / 10 + 1/ 20

= (2 + 1)/20

= 3/20

Therefore, A and B together can do work in 5 days = 3 x 5/20

= 3/4

The remaining work = 1 – 3/4

= (4 – 3)/4

= 1/ 4

Hence, the answer is (1) 1/4.