Sonu can complete a work in 25 days, and Kavita can do the same work in 20 days. Both work together for 5 days, after which Sonu leaves. How many days will it take for Kavita to complete the remaining work?

Correct option is C

 
Given:
- Sonu can complete the work in 25 days.
- Kavita can complete the work in 20 days.
- Both work together for 5 days, then Sonu leaves. Formula Used:
1. Work rate =
2. Remaining work = Total work - Work done in initial days Solution:
1. Calculate work rate of Sonu: Sonu's rate = 1/25
2. Calculate work rate of Kavita: Kavita's rate = 1/20
3. Combined work rate of Sonu and Kavita:
4. Work done in 5 days by both:
5. Remaining work: Remaining work = 0.55
6. Time taken by Kavita to complete remaining work: Time = 11 days Answer: (c) 11