Question

A, B and C can do a work in 20, 30 and 60 days
respectively. How many days does it need to
complete the work if A does the work and he is
assisted by B and C on every third day?
1. 10 days
2. 12 days
3. 8 days
4. 15 days
5. 5 days

Answer 1

answer of these question would be 15 days