Question 422613
Solution: Denote X degree the largest angle. The second angle is {{{2*X/3}}} degree and the first angle is 55 degree. We know that the sum of the three angles is 180 degree. Therefore we write:

     {{{x+2x/3+55=180}}}

     {{{ 5x/3 = 125}}}

      {{{ 5x = 375 }}}

          x = 75 

Answer: The largest angle is 75 degree, The second angle is {{{2*75/3}}} = 50 degree.