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.
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Question: At Music Outlet the regular price for a CD is \(d\) dollars. How many CDs can be purchased for m dollars when the CDs are on sale at 50\% off the regular price?
(A)\(\frac { m } { 50d } \) (B)\(\frac { md } { 50 } \) (C)\(\frac { md } { 2 } \) (D)\(\frac { m } { 2d } \) (E)\(\frac { 2m } { d } \)

Answer: E


Question: Mr. Gomes wrote a number on the blackboard. When he added 3 to the number, he got the same result as when he multiplied the number by 3. What was the number he wrote?
(A)-3 (B)0 (C)1.5 (D)\(\sqrt { 3 } \) (E)3

Answer: C


Question: A train takes one hour longer to travel d miles at its normal speed than it would if it were traveling 10 miles faster. Which of following equations could represent the equation to find the train's normal speed \(s\), in miles per hour?
(A)\(\frac { d } { s + 10 } = s + 1\) (B)\(\frac { d } { s } = \frac { d } { s + 1 } \) (C)\(\frac { s } { s + 10 } = d\) (D)\(\frac { d } { s + 10 } - \frac { d } { s } = 1\) (E)\(\frac { d } { s } - \frac { d } { s + 10 } = 1\)

Answer:
E