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: 11 is subtracted from 40 % of a number and results is 23. what is the number ?
Options: a. 160, b. 92, c. 88, d. 85, e. 34
[EX A]: d

[EX Q]: Problem: what is the smallest number which, when increased by 7, is divisible by 8, 11, and 24 ?
Options: a. 264, b. 257, c. 269, d. 270, e. 282
[EX A]: b

[EX Q]: Problem: johnson completes a piece of work in 10 days, vincent completes the same work in 40 days. if both of them work together, then the number of days required to complete the work is
Options: a. 7 days, b. 8 days, c. 9 days, d. 10 days, e. 12 days
[EX A]:
b