TASK DEFINITION: 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.
PROBLEM: Problem: if y exceeds x by 25 %, then x is less than y by ?
Options: a. 28 %, b. 21 %, c. 20 %, d. 30 %, e. 29 %

SOLUTION: c

PROBLEM: Problem: a man can row upstream at 25 kmph and downstream at 55 kmph, and then find the speed of the man in still water ?
Options: a. 65, b. 40, c. 30, d. 78, e. 38

SOLUTION: b

PROBLEM: Problem: what is the 10 digit to the right of the decimal point, in the decimal expansion of ( 1 / 2 ) ^ 10 ?
Options: a. 9, b. 4, c. 2, d. 1, e. 5

SOLUTION:
e