1. A can do a piece of work in 10 days and B can do the same work in 20 days. If both A and B work together, the total work will be completed in how many days?
2. If A can do a work in 10 days and B can do the same work in 15 days. If A works for 2 days and then B work for 3 days, then the amount of work completed is?
3. If A, B and C can do a piece of work in 10 , 15 and 25 days respectively. If all the three work together, then the work will be completed in how many days?
4. If Ram can do a work in 5 days and he is 20% more efficient than shyam. If both work together, the whole work will be done in?
5. If A can do a certain job in 25 days and he is 25% less efficient than B. If B works for 5 days and the remaining work was completed in how many days?