Question 233939
"Angle A is 4 times as large as Angle B" ___ A = 4B


"Angle C measures 20degrees less than Angle B" ___ C = B - 20


A + B + C = 180


4B + B + B - 20 = 180 ___  6B - 20 = 180 ___ 6B = 200 ___ B = 200/6 = 100/3


substituting ___ A = 4 (200/6) = 800/6 = 400/3


substituting ___ C = 200/6 - 120/6 = 80/6 = 40/3