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.

Eduardo drives to school at an average speed of 60 miles per hour and returns along the same route at an average speed of 30 miles per hour. If his total travel time is 3 hours, what is the total number of miles in the round trip?
(A)220 (B)190 (C)120 (D)85.5 (E)60
C

Every year the population of Northville is \(\frac { 3 } { 4 } \) of what it was 10 years earlier. If there are currently 800 people living in Northville, how many people will live there in 20 years?
(A)10 (B)200 (C)400 (D)450 (E)600
D

Selena has two types of records, worth a total of \$41.75. Of her 25 records, b records are worth \$1.25 each and the remaining d records are worth \$2.30 each. Selena has no other types of records . Which of the following sets of equations can be solved to determine how many of each record type Selena has?
(A)\(b + d = 4l.75 3.55(b + d) = 25\) (B)\(3.55 (b + d) = 41.75 l.25(b + d) = 2.30\) (C)\(3.55(b + d) = 41.75 1.25b + 2.30d = 25\) (D)\(b + d = 25 2.30b + 1.25d = 41.75\) (E)\(b + d = 25 1.25b + 2.30d = 41.75\)

E