Jaya can sew a set of curtains in 25 days and Karthik in 20 days. They work together for 5 days. What fraction of the job is still left?

Explanation

1. 01

   Together: $\frac{1}{25} + \frac{1}{20} = \frac{4+5}{100} = \frac{9}{100}$ per day.

2. 02

   In 5 days: $\frac{45}{100} = \frac{9}{20}$ done.

3. 03

   Left: $1 - \frac{9}{20} = \frac{11}{20}$.