Question 1103749
The angles in a triangle sum to 180.
{{{A+B+C=180}}}
and
{{{A=4C}}}
{{{C=A/4}}}
and
{{{B=A-27}}}
Substituting,
{{{A+(A-27)+A/4=180}}}
{{{(9/4)A=207}}}
Solve for A, then use the other equations to solve for B and C.