SOLUTION: if 12a+6b=54, what is the average of a & b ? (A)2.25 (B)4.5 (C)6 (D)Data insufficient

Algebra ->  Average -> SOLUTION: if 12a+6b=54, what is the average of a & b ? (A)2.25 (B)4.5 (C)6 (D)Data insufficient      Log On


   

Question 935210: if 12a+6b=54, what is the average of a & b ?
(A)2.25
(B)4.5
(C)6
(D)Data insufficient
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
Think about the equation and the question. a and b will fit on a line. Do you want to try solving for each in terms of the other and then find their average? You will have just an expression of a and b. Try that, and the meaning will be very clear.