Here is a story problem.
Sally purchases cheap dryer sheets. After many scientific experiments, Sally discovers that the cheap dryer sheets only keep whites un-clingy if she uses three sheets per load. Sally also discovers that she needs only one cheap dryer sheet per load of other items.
When Sally buys the expensive dryer sheets, she needs only one sheet per load regardless of the load content. Sally washes about five and a half loads of laundry per week, one of which is whites.
Can someone please figure out which dryer sheets are more cost effective for poor Sally? Because she much prefers blogging or reading romance novels to doing laundry or math.