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.

[Q]: Problem: micheal and adam can do together a piece of work in 20 days. after they have worked together for 15 days micheal stops and adam completes the remaining work in 10 days. in how many days micheal complete the work separately.
Options: a. 40 days, b. 100 days, c. 120 days, d. 110 days, e. 90 days
[A]: a


[Q]: Problem: a light flashes every 30 seconds, how many times will it flash in ? of an hour ?
Options: a. 550, b. 600, c. 650, d. 700, e. 120
[A]: e


[Q]: Problem: if 2 ^ 4, 3 ^ 3, and 13 ^ 3 are factors of the product of 1,452 and w, where w is a positive integer, what is the smallest possible value of w ?
Options: a. 198, b. 288, c. 363, d. 396, e. 468
[A]:
e