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.
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Question: Problem: the average runs scored by a batsman in 30 matches is 50. in the next 15 matches the batsman scored an average of 26 runs. find his average in all the 45 matches ?
Options: a. 31, b. 42, c. 29, d. 97, e. 27

Answer: b


Question: Problem: walking at 4 / 5 of her normal speed, a worker is 10 minutes later than usual in reaching her office. the usual time ( in minutes ) taken by her to cover the distance between her home and her office is
Options: a. 30, b. 35, c. 40, d. 45, e. 50

Answer: c


Question: Problem: a class consists of 15 biology students and 10 chemistry students. if you pick two students at the same time, what ' s the probability that one is maths and one is chemistry ?
Options: a. 2 / 7, b. 5 / 7, c. 1 / 2, d. 3 / 7, e. 1 / 2

Answer:
c