11. A and B finish the job in 15 days.while A,B and C can finish it in 10 days . C alone will finish the job in 


12. If 32 men and 24 days can reap a field in 9 days in how many days will 28 men and 12 boys reap it supposing that 4 men can do as much as 6 boys? 


13. A certain number of men can do a work in 40 days . If there were 5 men less it could be finished in 10 days more . How many men are there? 


14. There is a sufficient food for 200 men for 20 days after 15 days 100 men leave the place. For how many days will the rest of the food last for the rest of the men? 


15. If A can complete a work in 36 days and B can do the same work in 42days. If A after doing 6 days, leaves the work, find in how many days B will do the remaining work ? 


16. A and B can do a piece of work in 12 days and 24days. Both starts the work together for some time, but B leaves the job 6 days before the work is completed. Find the time in which work is finished. 


17. A can do a piece of work in 15 days. A does the work for 5 days only and leaves the job. B does the remaining work in 6 days.In how many days B alone can do the work? 


18. 36 workers can reap a field in 6 days. If the work is to be completed in 4 days, the extra workers required are 


19. A does work in 20 days and B does work in 30 days. In how many days they together will do the same work? 


20. A tyre has two punctures. The first puncture alone would have made the tyre flat in 10 min and second alone would have done it in 20min. If air leaks out at a constant rate how long does it take both the punctures together to make it flat? 


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Those are all planning for any competitive examinations can use this segment to enhance their abilities.