Question 571744
I agree with A+B+C=180 and B=3A
However the translation for "The measure of angle C is 20 degrees more than that of angle A" is C=A+20
You get the system of equations
{{{system(A+B+C=180, B=3A, C=A+20)}}}
Substituting the expressions for B and C from the second and third equations into the first equation, you get
{{{A+3A+(A+20)=180}}}--> {{{A+3A+A+20=180}}} --> {{{5A+20=180}}} --> {{{5A=160}}} --> {{{A=32}}}
Now you can substitute the value found for A in the last two equations to find B and C
{{{B=3*32}}} --> {{{B=96}}}
{{{C=32+20}}} --> {{{C=52}}}