9 men can finish a task in 4 days. How many days will 6 men take to finish the same task ?
20 men can complete a task in 4 days. How many men will be able to complete the same task in 2 days?
A can finish a task in 18 days and B can complete the same task in 15 days. B worked for 10 days and left the job. How many days will A take to finish the remaining task when working alone?