Originally Posted by

**ebaines** I don't know how you have defined 'x' and 'y', but if they are the rates that 1 man or 1 child can work - expressed in terms of amount of job completed per day - then the time for one man or 1 child to complete the task alone is the inverse of that. However - by my calculations the rates of work by a man or a child are much less than what yuo have calculated. Please show us the two equations that you set up and solved. Remember to be consistent in terms of work completed = number of people times rate of work per person per day times days.