Time and work formulas with examples for SSC and Bank Exams

A and B can do a piece of work in 20 days and 30 days respectively. They started the work together but after 8 days they doing work in alternate days, started with B. how many days the work will be completed? 

A work is done by 30 workers not all of them have the same capacity to work. Every day exactly 2 workers, do the work with no pair of workers working together twice. Even after all possible pairs have worked once, all the workers together works for six more days to finish the work. Find the number of days in which all the workers together will finish the work?

If A alone take 4 days more than A and B worked together. If B alone take 16 days more than A and B together. How many days they take together? 

If 6 men and 8 boys can do a piece of work in 10 days and 26 men and 48 boys can do the same in2days, then the time taken by 15 men and 20 boys to do the same type of work will be

A and B together can complete a particular task in 6 days. If A alone can complete the same task in 10 days, how many days will B take tocomplete the task if he works alone?