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: If the 15th day of a month is three days earlier than Saturday, What day will it be on the 24th day of the month?

 Option A: Saturday

 Option B: Monday

 Option C: Sunday

 Option D: Wednesday

 Option E: Friday
[EX A]: Option E

[EX Q]: Question: If the average (arithmetic mean) of 18 consecutive odd integers is 414, then the least of these integers is

 Option A: a

 Option B: b

 Option C: c

 Option D: d

 Option E: e
[EX A]: Option A

[EX Q]: Question: What is the total number of positive integers that are less than 400 and that have no positive factor in common with 400 other than 1?

 Option A: 100

 Option B: 120

 Option C: 150

 Option D: 160

 Option E: 180
[EX A]:
Option D