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.
--------
Question: Problem: 4, 12, 48, 240, 1440, 10080,80640 (... )
Options: a. 7620, b. 10080, c. 6200, d. 10020, e. 725760

Answer: e


Question: Problem: what number must be added to 6, 16 and 8 to get an average of 13 ?
Options: a. 23, b. 22, c. 44, d. 33, e. 55

Answer: b


Question: Problem: a train 100 m long crosses a platform 125 m long in 15 sec; find the speed of the train ?
Options: a. 91.2 kmph, b. 61.9 kmph, c. 45.9 kmph, d. 61.2 kmph, e. 71.2 kmph

Answer:
d