A math teacher and his students provide step-by-step solutions to word problems dealing with proportions. Example questions include, "A recipe for 16 brownies calls for 2/3 cup of butter. How many brownies can be made from 1 cup of butter?" and "1 lap is 1/4 mile, how many laps to run 3 1/2 miles?" In the left hand menu, click on Basic Mathematics, Solving Proportions, Applications.