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 speed of a boat in still water is 15 km / hr and the rate of current is 3 km / hr. the distance travelled downstream in 24 minutes is
Options: a. 17.2 km, b. 7.2 km, c. 7.6 km, d. 17.6 km, e. 27.2 km
answer:
b


question:
Problem: what is the sum of natural numbers between 30 and 100
Options: a. 4615, b. 4860, c. 5000, d. 5500, e. 5550
answer:
a


question:
Problem: a set s = { x, - 8, - 7, - 6, 6, 8, 9, y } with elements arranged in increasing order. if the median and the mean of the set are the same, what is the value of | x | - | y | ?
Options: a. 1, b. 0, c. 2, d. - 1, e. can not be determined
answer:

c