Question 1131586
A minor point:
It's not 5/12ths.
It's either 5/12, or 5 12ths.
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PS - We all make mistakes.  If a tutor makes a mistake, it can be educational.  The student can locate the mistake and learn from it.
I don't think a person working for no pay to assist someone he/she doesn't know should be insulted or treated rudely by another person.
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I'm more concerned that too often the tutors do the problem for the student, and the student gets the answer and moves on, learning nothing.