TASK DEFINITION: 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.
PROBLEM: Problem: if 5 a = 3125, then the value of 5 ( a - 3 ) is :
Options: a. 25, b. 125, c. 625, d. 1625, e. none of these

SOLUTION: a

PROBLEM: Problem: a and b started a business investing rs. 80,000 and rs 20,000 respectively. in what ratio the profit earned after 2 years be divided between a and b respectively ?
Options: a. 4: 1, b. 3: 2, c. 18: 20, d. 18: 4, e. 17: 4

SOLUTION: a

PROBLEM: Problem: two cubes have their volumes are in the ratio 1: 27. find the ratio of their surface area ?
Options: ['a. 1: 2', 'b. 2: 3', 'c. 1: 9', 'd. 2: 7', 'e. 3: 11']

SOLUTION:
c