B = 0.5A + 30 C = 1.5A + 20 If B = C, that means we can set the two equations equal to each other. 0.5A + 30 = 1.5A + 20 A = 10... Plug that into one of the equations to find B or C (they are the same).. B = 0.5 * 10 + 30 = 35 35 + 35 + 10 = 80 total.
