A can complete a work in 20 days, and B can complete it in 30 days. If they work together for 6 days, what fraction of the work is left?
Q1. A can complete a work in 20 days, and B can complete it in 30 days. If they work together for 6 days, what fraction of the work is left?
Answer: 2/5
Explanation: The combined work rate is 1/20 + 1/30 = 3/60 + 2/60 = 5/60 = 1/12. Work done in 6 days is 6 * (1/12) = 1/2.