I think this question was incorrectly put on hold:
The reason given was: "Homework questions must demonstrate some effort to understand the underlying concepts."
Not only did the student demonstrate effort, he also demonstrated enough understanding to properly calculate the value of Q. He posted the question in part to determine if his calculation was correct.
One commenter on the post itself said the question wasn't sufficiently clear, but to me it was certainly clear enough to answer. Perhaps the concern was that it wasn't posted in a way that it was clear enough to act as a resource for future students. But that's often the case with student questions on this site.
Further, given the question had already been asked and answered, what is the purpose of subsequently putting it on hold?