TASK DEFINITION: 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.
PROBLEM: Kim owned \(\$100\). After winning \(\$p\) in one game and losing \(\$q\) in the next game, she owned \(\$80\). What is the value of \(p - q\)?
(A)10 (B)20 (C)30 (D)-10 (E)-20

SOLUTION: E

PROBLEM: After 4 apples were added to a sack, there were 3 times as many apples in the sack as before. How many apples were in the sack before the addition?
(A)0 (B)1 (C)2 (D)3 (E)4

SOLUTION: C

PROBLEM: Ninety people work in a certain office. If the ratio of men to women is 7:8, how many more women than men work in the office?
(A)1 (B)2 (C)4 (D)6 (E)15

SOLUTION:
D