Task: Question Answering
Input (English): Question: P, Q and R can do a work in 20, 30 and 60 days respectively. How many days does it need to complete the work if P does the work and he is assisted by Q and R on every third day?

 Option A: 10 days

 Option B: 14 days

 Option C: 15 days

 Option D: 9 days

 Option E: 5 days
Output (English): Option C