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: a train traveling at 72 kmph crosses a platform in 33 seconds and a man standing on the platform in 18 seconds. what is the length of the platform in meters ?
Options: a. 240 meters, b. 360 meters, c. 420 meters, d. 300 meters, e. can not be determined
[A]: d


[Q]: Problem: how many positive even integers less than 100 contain digits 5 or 7 ?
Options: a. 10, b. 17, c. 18, d. 19, e. 20
[A]: a


[Q]: Problem: a restaurant spends one quarter of its monthly budget for rent and half of the rest for food and beverages. what percentage of the budget does the restaurant spend for food and beverages ?
Options: a. 23.5 %, b. 32.5 %, c. 35 %, d. 37.5 %, e. 75 %
[A]:
d