instruction:
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.
question:
Question: The original price of a shirt was $20. It was decreased to $15 . What is the percent decrease of the price of this shirt.

 Option A: 25%

 Option B: 35%

 Option C: 45%

 Option D: 55%

 Option E: 65%
answer:
Option A


question:
Question: There are n arithmetic means between 3 and 45 such that the sum of these arithmetic means is 552. find the value of n.

 Option A: 11

 Option B: 15

 Option C: 17

 Option D: 21

 Option E: 23
answer:
Option E


question:
Question: A printer numbers the pages of a book starting with 1 and uses 3189 digits in all. How many pages does the book have ?

 Option A: 1000

 Option B: 1074

 Option C: 1075

 Option D: 1080

 Option E: 1089
answer:

Option B