Time and Work Questions

A can do a work in 12 days while B can do it in 15 days. They undertake to complete it together for Rs. 450. what will be the share of A in this amount of money ?

P and Q can do a project in 20 and 12 days respectively. In how many days can they complete 40% of the project if they work together?

If 15 persons can do a job in 30 days, then 30 persons with twice the efficiency can do the same job in how many days?

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?

Arun and Amit can do a piece of work in 9 days and 12 days respectively. If they work for alternate days and Amit starts the work first, then in how many days 35/36 parts of whole work will be completed?

A and B together do a job in 15 days and A alone could do the same job in 20 days. How many days would B take to do half the job if he worked alone?

A and B can together do a piece of work in 6 days and A alone can do it in 9 days. The number of days B will take to do it alone is

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?