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: If 5 more than 3 times a certain number is 3 less than the number, what is the number?
(A)\(-7\) (B)\(-4\) (C)\(-\frac{1}{2}\) (D)4 (E)7
Example Output: B

Example Input: The percent increase from 6 to 16 is equal to the percent increase from 12 to what number?
(A)16 (B)22 (C)23 (D)32 (E)36
Example Output: D

Example Input: If 70 percent of x is 2,100, then what is 40 percent of x?
(A)3,000 (B)2,020 (C)1,800 (D)1,470 (E)1,200
Example Output:
E