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: there are 15 boys and 10 girls in a class. if three students are selected at random, in how many ways that 1 girl or 2 boys are selected ?
Options: a. 100, b. 105, c. 115, d. 120, e. 125
answer:
c


question:
Problem: the total age of a and b is 15 years more than the total age of b and c. c is how many year younger than
Options: a. 14 years, b. 12 years, c. 56 years, d. 66 years, e. 15 years
answer:
e


question:
Problem: if w / x = 2 / 3 and w / y = 3 / 5, then ( x + y ) / y =
Options: a. 4 / 5, b. 9 / 10, c. 7 / 5, d. 8 / 5, e. 9 / 5
answer:

b