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 library has an average of 1000 visitors on Sundays and 700 on other days. The average number of visitors per day in a month of 30 days beginning with a Sunday is :

 Option A: 740

 Option B: 750

 Option C: 760

 Option D: 770

 Option E: 775
[EX A]: Option B

[EX Q]: Question: In a photography exhibition, some photographs were taken by Octavia the photographer, and some photographs were framed by Jack the framer. Jack had framed 24 photographs taken by Octavia, and 12 photographs taken by other photographers. If 36 of the photographs in the exhibition were taken by Octavia, how many photographs were either framed by Jack or taken by Octavia?

 Option A: 36

 Option B: 48

 Option C: 72

 Option D: 96

 Option E: 108
[EX A]: Option B

[EX Q]: Question: If 0 < a < b and k = (2a + 9b)/b , which of the following must be true?

 Option A: k < 2

 Option B: k < 7

 Option C: k < 9

 Option D: k > 9

 Option E: k > 11
[EX A]:
Option D