Susan was supposed to use of a cup of butter in her recipe, but she only used of a cup of butter. 11. f a. what fraction of the butter that she should i have used did susan actually use? make a math drawing to 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. t 12. b. describe the different unit amounts that occur in part (a). discuss how one amount can be de- scribed with two different fractions depending a on what the unit amount is taken to be.