On a recent geography test, Amanda scored 5 point below the class
average, Barb scored 8 points above the class average, and collin
scored 82. The average of the scores of Amanda,Barb, and Collin was
equal to the class average. What is the class average?

I know the answer to this but I wom't stiff a researcher out of their two bucks

Yours 

Mongolia

I don't mind stiffing:

Let A, B and C be the scores for Amanda, Barb and Collin respectively
and let S be the average score on the exam.  Then,

A = S - 5
B = S + 8
C = 82

Adding all 3 equations up we get

A + B + C = 2S + 85

and since the average scores of the 3 were the class average we know that

(A + B + C)/3 = S

or A + B + C = 3S

we can substitute this for the left-hand side of our first equation and get

3S = 2S + 85

Solving for S gives

S = 85


P.S. Don't pay for answers like this.  Go to a math forum.  Here's a
great one:  http://mathforum.org/