1. A can do a piece of work in 40 days, B in 30 days & (A + B + C) in 10 days. In how many days C alone can do it.
2. (A+B) can do a work is 6 days, while (B+C) can do the same work in 8 days. In (C+A) can do the same work in 12 days. In how many days A, B, C together complete the whole work also find their individiual completion time.
3. A takes 9 days to finish a job while B takes 27 days to finish the same job. Find the ratio of their efficiencies ?
4. A is thrice as efficient as B and A takes 40 days to do a job, then in how many days B can finish the same job.
5. A is thrice as efficient as B and therefore able to finish a job in 100 days less than B. Find the time in which A and B can complete the work individually & in how many days they can complete the work , working together ?
6. A can do a piece of work in 20 days. B is 25% more efficient than A. Find the number of days taken by B to do the same piece of work.
7. A can complete a work in 10 days, B in 12 days and C in 15 days. All they began the work together but A had to leave the work after 2 days of starting & B leaves 3 days before the completion of the work. How long did the work last ?
8. A can finish a work in 15 days and B can do it in 60 days. After A had worked for 5 days, B also joined A to finish the remaining work. Remaining work will be finished in how many days.
9. A can do a piece of work in 15 days. He started the work & left after some days when 20% work was done. After it B joined and completed the work in 20 days. In how many days A & B can complete the whole work.
10. A alone can complete a work in 14 days and B alone in 18 days. Starting with A they work on alternate days. The total work will be completed in how many days.