Two persons could fit new windows in ahouse in 3days.(i) One of the persons fell ill before the work started.How long would the job take now? (ii)How many persons would be needed to fit the windows in one day?

A contractor estimates that 3 persons could rewire Jasminder's house in 4 days.If,he uses 4 persons instead of three,how long should they take to complete the job?

2 men and 7 boys can do a piece of work in 4 days. It is done by 4 men and 4 boys in 3 days. How long would it take for one man or one boy to do it ?

A committee of two persons is selected from two men and two women.How many ways can it be done when committee contains at least one man.

A committee of two persons is selected from two men and two women.How many ways can it be done when committee contains at most one man

It takes 12 hours to fill a swimming pool using two pipes. If the pipe of longer diameter is used for 4 hours and the pipe of smaller diameter is used 9 hours, one half of the pool is filled. How long would it take for each pipe to fill the pool separately.