This real-world example problem is useful to know how to do, especially if you have a busy schedule and need to plan ahead. Now, think if the family had 4 kids, how quick could they fold that same load of laundry. I challenge the class (anyone) to work this expanded problem:
Mom folds 30 pieces in 15 minutes
Son folds 30 pieces in 30 minutes
Daughter folds 30 pieces in 20 minutes
Dad folds 30 pieces in 15 minutes
Son#2 folds 30 pieces in 25 minutes
Daughter #2 folds 30 pieces in 40 minutes
How fast can this family fold 30 pieces of laundry if working together (assuming of course they don't get in each other's way, and can work at the same rate as if working alone)?
First we find out the rate of work for each member of the family.
Mom = 30/15 = 2
Son1 = 30/30 = ...
A Complete, Neat and Step-by-step Solution is provided.