Question

the second angle of the a triangle is twice as large as the first angle. the measure of the third angle is 20 degrees less than the second. how large is each angle?

Answer 1

First angle = A
second angle = B
Third angle = 3
A + B + C = 180
B = 2A
C = B - 20

B/2 + B + (B-20) = 180
5/2 B = 200
B = (2/5)*200 = 80
You finish it.

Answer 2

40 degrees 60 degrees and 80 degrees