Question

I'm studying for the sat, and heres a question I'm confused about.
If the average of A, B, and C is P, what is C in terms of B,C, and P? Could someone walk me through this?

Answer 1

I have this equation.. A+B+C/3 = P, I just dont know how to proceed.

Answer 2

(A+B+C)/3 = P
on both sides multiply by 3, we get
A+B+C = 3P or
C+(A+B) = 3P
subtracted by (A+B) on both sides
C = 3P - (A+B)