Ok, everyone has been very helpful with my previous questions and helping me understand and work through the problems. Here is one that does not seem to have a linear equation behind it.

According to Dr. Aaron R. Folsom of the University of Minnesota School of Public Health, your maximum ideal waist size is directly proportional to your hip size. For a woman with 40-inch hips, the maximum ideal waist size is 32 inches. What is the maximum ideal waist size for a woman with 35-inch hips?

Ideal waist size.