You are given a mathematical question described with an open-ended vocabulary. Questions in this task involve real-world situations, describing a mathematical problem. You are also given 4 or 5 answer options (associated with "A", "B", "C", "D", "E"). Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D', 'E'. LaTeX mathematical format (the standard way to express mathematical expressions in the typesetting software known as LaTeX) is used to express equations. Each question is solvable with high school math knowledge. Give only one answer for each question.

[EX Q]: If \(p\) items can be purchased for 60 dollars, how many items can be purchased for \(w\) dollars?
(A)\(\frac { wp } { 60 } \) (B)\(\frac { w } { 60p } \) (C)\(\frac { 60p } { w } \) (D)\(\frac { 60 } { wp } \) (E)\(\frac { 60w } { p } \)
[EX A]: A

[EX Q]: A coffee shop sold 35 cups of coffee. Of these, 15 contained sugar and 12 contained milk. If 13 cups contained neither milk nor sugar, how many cups must have contained both sugar and milk?
(A)3 (B)5 (C)7 (D)8 (E)12
[EX A]: B

[EX Q]: A scientist found that the time, in seconds, a mouse required to complete a maze test successfully varied inversely with the number of hours of sleep the mouse had the previous night, such that time = \(\frac { 320 } { sleep } \). If the mouse had 8 hours of sleep the night before a maze test, how long, in seconds, would the mouse take to complete the maze test?
(A)40 (B)160 (C)320 (D)1,280 (E)2,560
[EX A]:
A