A and B together can do a work in 12 days. B and C together can do it in 15 days. If A is twice as efficient as C, how many days will A take?
Q1. A and B together can do a work in 12 days. B and C together can do it in 15 days. If A is twice as efficient as C, how many days will A take?
Answer: 22.5 days
Explanation: Let's denote the rate of work of A, B, and C as A, B, and C. A + B = 1/12 and B + C = 1/15. A = 2C. Solving these, we get A's rate and then the time A will take.