SOLUTION: In a triangle, the measure of the first angle is 20 more than the measure of the second angle. The third angle is twice the measure of the second angle. Find the measure of the thi

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Question 342811: In a triangle, the measure of the first angle is 20 more than the measure of the second angle. The third angle is twice the measure of the second angle. Find the measure of the third angle.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
In a triangle,
A%2BB%2BC=180
.
.
.
A=20%2BB
C=2B
Substituting,
%2820%2BB%29%2BB%2B%282B%29=180
4B%2B20=180
4B=160
B=40degrees
Then
C=2%2840%29
highlight%28C=80%29 degrees