<PRE><B>Question 331904</B>
let first angle = x
second angle = 3x
third angle = x+55
..
The sum of angles of triangle = 180(deg)
x+3x+x+55=180
5x+55=180
add -55
5x+55-55=180-55
5x=125
divide by 5
5x/5=125/5
x=25  
first angle 25 deg
second angle = 3x= 75 deg
third angle = x+55 = 25+55=80 deg.
CHECK
80+75+25=180</PRE>