• # question_answer 14) A and B can do a piece of work in 10 days. B and C can do it in 12 days. A and C can do it in 15 days. How long will A take to do it alone? A) 24 days            B) 40 daysC) 30 days            D) 20 days

Work done by A, B and C together in 1 day $=\left[ \frac{1}{10}+\frac{1}{12}+\frac{1}{15} \right]$ $=\frac{1}{8}$ Now, work done by A alone in 1 day $=\frac{1}{8}-\frac{1}{12}$ $=\frac{1}{24}$ Hence, A will take to do it alone m 24 days.