Time and Work Questions

Some carpenters promised to do a job in 15 days but 3 of them were absent and remaining did the job in 20 days. What was the original number of carpenters?

Manjeet can do a work in 18 hours. If he is joined by Jaya who is 100% more efficient, in what time will they together finish the work?

A, B and C can do job in 9, 12 and 36 days respectively if they worked alone. A leaves after they have worked together for 3 days. In how many days can B and C do the rest of the job?

A,B and C together can finish a task in 7.5 days. C is thrice as productive as A and B alone can do the task in 15 days. In how many days can A and C do the job if B goes on leave?

A can paint a house in 45 days and B can do it in 15 days. Along with C, they did the job in 5 days only. Then, C alone can do the job in how many days?

A can do a work in 36 days and B in 12 days. If they work on it together for 3 days, then what fraction of work is left?

P and Q can complete a task in 50 and 20 days respectively. In how many days can they complete 70% of the task if they work together?

A can do a work in 16 days and B in 20 days. If they work on it together for 8 days, then what fraction of work is left?