instruction:
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: the average score of a cricketer in 2 matches is 30 and in other 3 matches is 40. then find the average score in all the 5 matches ?
Options: a. 25, b. 27, c. 30, d. 35, e. 36
answer:
e

question:
Problem: when positive integer n is divided by 3, the remainder is 1. when n is divided by 7, the remainder is 5. what is the smallest positive integer k such that k + n is a multiple of 21 ?
Options: a. 2, b. 4, c. 6, d. 8, e. 10
answer:
a

question:
Problem: the speed of a boat in still water is 60 kmph and the speed of the current is 17 kmph. find the speed downstream and upstream ?
Options: a. 77,43 kmph, b. 80,80 kmph, c. 80,42 kmph, d. 80,40 kmph, e. 83,40 kmph
answer:
a