You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.

[EX Q]: Question: A student missed 6% of the questions on a test. If the student missed 12 questions, how many questions were on the test?

 Option A: 100

 Option B: 150

 Option C: 200

 Option D: 250

 Option E: 300
[EX A]: Option C

[EX Q]: Question: The number of diagonals of a polygon of n sides is given by the formula z=n(n-3)/2. If a polygon has twice as many diagonals as sides, how many sides does it have?

 Option A:  3

 Option B:  5

 Option C:  6

 Option D:  7

 Option E:  8
[EX A]: Option B

[EX Q]: Question: 1/3 +1/2 - 5/6 + 1/5 + 1/4 - 9/20 -1=

 Option A: 1

 Option B: 2/15

 Option C: 2/5

 Option D: 9/20

 Option E: 5/6
[EX A]:
Option A