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 mean of 50 observations is 200. but later he found that there is decrements of 34 from each observations. what is the the updated mean is ?
Options: a. 165, b. 166, c. 190, d. 198, e. 199
answer:
b


question:
Problem: if a sum of money doubles itself in 20 years at simple interest, the ratepercent per annum is
Options: a. 12, b. 12.5, c. 13, d. 5, e. 14
answer:
d


question:
Problem: rahul put his timepiece on the table in such a way that at 6 p. m. hour hand points to north. in which direction the minute hand will point at 9.15 p. m. ?
Options: a. 233, b. 37, c. 27, d. west, e. 271
answer:

d