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 can do a piece of work in 16 days. when he had worked for 2 days b joins him. if the complete work was finished in 8 days. in how many days b alone can finish the work ?
Options: a. 18, b. 77, c. 66, d. 55, e. 12
Solution:
e