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.
Q: Problem: the result when a number subtracted from 150 is the same as the number added to 68. what is the number ?
Options: a. 110, b. 100, c. 109, d. 218, e. 210
A:
c