If c = (1/4)a and b = 7c, then which of the following represents the average (arithmetic mean) of a, b, and c, in terms of c ?  Choose the correct choice from the following answers:
A) 2b
B) 3b
C) 4b
D) 5b
E) 12b
a = (4)c and b =7c.   The mean = (a + b + c)/3 = (4c + 7c + b)/3 = 4b.   Answer is 4b
<result>C</result>
If c = (1/4)a and b = 7c, then which of the following represents the average (arithmetic mean) of a, b, and c, in terms of c ?