Susan was supposed to use 5/4 of a cup of butter in her recipe, but she only used 3/4 of a cup of butter.

a. 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.

b. Describe the different unit amounts that occur
in part (a). Discuss how one amount can be de-
scribed with two different fractions depending
on what the unit amount is taken to be.