Problem: a collection of books went on sale , and 2 / 3 of them were sold for $ 3.25 each . if none of the 20 remaining books were sold , what was the total amount received for the books that were sold ?
Rationale: "if 20 books constitute 1 / 3 rd of the total , then 2 / 3 rd of the total = 40 books amount received for sold books = 40 * 3.25 = $ 130 answer : a"
annotated_formula: multiply(2, divide(multiply(20, divide(2, 3)), divide(const_1, 3)))