If 8m − n = p, then which of the following represents the average (arithmetic mean) of m, n, and p, in terms of m?  Choose the correct choice from the following.
A) 2m −1  B) 3m  C) 6m  D) m/5  E) 6m/5
8m - n = p   Add n to both sides:   8m = n + p   Add m to both sides:   9m = n + p + m   Now, divide both sides by 3   3m = (n + p + m)/3 = the average of n, p, and m   3m
<result>B</result>
If 8m − n = p, then which of the following represents the average (arithmetic mean) of m, n, and p, in terms of m?