How to become topper in 21 days

A and B can complete a task in 12 days. However, A had to leave a few days before the task was completed and hence it took 16 days in all to complete the task. If A alone could complete the work in 21 days, how many days before the work getting over did A leave?

A can do a piece of work in 14 days while B can do it in 21 days. In how many days, working together they will complete the whole work?

If 5 men or 9 women can do a piece of work in 19 days,then in how many days will 3 men and 6 women do the same work? 12 b.15 c.backslash18 d.21

Prashnath is twice as good a sportsman as Tarun and together they finish a piece of work in 21 days. In how many days with Rarun alone finish the work ? A. 42 B. 63 C. 84 D. 50

30 men can finish a piece of work in 28 days. How many days will be taken by 21 men to finish it?

21 men can complete a piece of work in 42/7 days. In how many days can 18 men complete the same piece of work?

Rohit, Mohit and Sumit individualy can complete a work in 8 days, 14 days and 21 days respectively. In how many days these three together can complete the same work?