Detailed Instructions: 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: a take twice as much time as b or thrice as much time to finish a piece of work. working together, they can finish the work in 7 days. b can do the work alone in ?
Options: a. 19, b. 12, c. 11, d. 42, e. 114
Solution:
d