Time and Work on Arithmetic Aptitude related Questions and Answers

Question :   A and B and C together can finish a piece of work in 4 days. A alone can do it in 12 days, and B in 18 days. Then, C alone can do it in 1. 8 days 2. 7 days 3. 9 days 4. 10 days Answer :   3 - 9 days