Mohan can dig a well in 15 days, Shyam is 25% better than Mohan. How many days does Shyam alone can take to dig the same well?

Rakesh can do a certain job in 12 days. Vipin is 60% more efficient than Rakesh. How many days will Vipin alone take to do the same job ?

Abhimanyu can do 25% of a piece of work in 5 days. How many days will he take to complete the work ten times ?

30 boys are engaged to do a piece of work in 15 days but it is found that in 5 days, 3/5 work is completed. How many boys may be allowed to go off, so that the work may be finished on time?

The construction work is assign to the Group-I of 7 workers. They complete the task in 12 days. The another Group-II started the same task with same number of workers. They started the work and just after 5th day their 2 workers left the work. Now, in how many days this Group will complete the task ?

Ram can do a piece of work in 10 days and Anshu in 20 days. They work together but 2 days before the completion of the work, Ram leaves and Anshu completes the work. In total how many days was the work completed?

X is twice as good a workman as Y and together they finish a piece of work in 18 days. In how many days will X alone finish the work?