Given a math problem with context and a question and 5 answer choices, the task is to provide the correct answer choice based on the problem. You must choose one of the given answer choices by letter: a, b, c, d, or e; anything else is invalid.

[EX Q]: Problem: what is the total number of integers between 10 and 50 that are divisible by 2 ?
Options: a. 18, b. 19, c. 22, d. 25, e. 10
[EX A]: b

[EX Q]: Problem: if 12 machine can finish a job in 40 days, then how many more machines would be needed to finish the job in one - fourth less time ?
Options: a. a. 4, b. b. 8, c. c. 10, d. d. 12, e. e. 16
[EX A]: a

[EX Q]: Problem: if log 2 = 0.3010 and log 3 = 0.4771 then the value of log 4.5 is :
Options: a. 0.6532, b. 0.7727, c. 0.3266, d. 0.3796, e. none of these
[EX A]:
a