Chapter 2.2, Problem 7P

Susan was supposed to use $\frac{5}{4}$ of a cup of butter in her recipe, but she only used $\frac{3}{4}$ of a cup of butter.

1. What fraction of the butter that she should have used did Susan actually use? Make a math drawing to help you solve this problem and explain your solution. Use our definition of fraction in your explanation and attend to the unit amount that each fraction is of.
2. Describe the different unit amounts that occur in part (a). Discuss how one amount can be described with two different fractions depending on what the unit amount is taken to be.