A and B can finish work in 30 days if they work together. They worked together for 20 days and then B left. A finished the remaining works in another 20 days. In how many days A alone can finish the work?
Asif and Umer can complete a work in 15 days and 10 days respectively. Asif & Umer started the work together and then Umer left after 2 days. Asif alone completed the remaining work. The work was finished in__________days.