Which situation could be modeled by the expression 13÷5 ? a. one-third pound of sugar is used for 5 cupcakes. how much sugar is used for each cupcake? b. three cups of sugar are used for 5 cupcakes. how much sugar was used for each cupcake? c. one-third cup of sugar is used for each of 5 cupcakes. what is the total amount of sugar used? d. each of 5 cupcakes used 13 pound of sugar. what is the total amount of sugar used?