You are given a mathematical question described with a circumscribed mathematical vocabulary. Questions in this task usually contain some variables (e.g. X, Y), equations (e.g. X+Y=3) and some relationships (X is greater than Y). Often you need to find the value of the variable using equations and relationships. 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.

Example Input: The average (arithmetic mean) of two numbers is equal to twice the positive difference between the two numbers. If the larger number is 35, what is the smaller number?
(A)3 (B)9 (C)15 (D)21 (E)27
Example Output: D

Example Input: What is the greatest value of \(x\) that is a solution of the following equation? \(|x - 5| + 10 = 15\)
(A)0 (B)5 (C)10 (D)20 (E)30
Example Output: C

Example Input: In the equation \(y = kx\), \(x = 4\) when \(y = 6\) and k is a constant. What is the value of y when \(x = 16\)?
(A)1 (B)2 (C)10 (D)14 (E)24
Example Output:
E