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: if a and b are the roots of the equation x 2 - 9 x + 9 = 0, then the value of a 2 + b 2 is :
Options: a. 63, b. 24, c. 17, d. 6, e. 5

Answer: a


Question: 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

Answer: a


Question: Problem: buffalo gives 4 liter milk, cow gives ( 1 / 2 ) liter milk and goat gives 1 / 4 liter milk. you have to get 20 liter milk by 20 animals. what is the number of goats ?
Options: a. 1, b. 2, c. 3, d. 4, e. 5

Answer:
b