Teacher: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.
Teacher: Now, understand the problem? Solve this instance: Problem: 5 drainage pipes, each draining water from a pool at the same constant rate, together can drain a certain pool in 12 days. how many additional pipes q, each draining water at the same constant rate, will be needed to drain the pool in 4 days ?
Options: a. 6, b. 9, c. 10, d. 12, e. 15
Student:
c