Question 317562
The sum of the angles in a triangle is 180.
{{{A+B+C=180}}}
{{{A+4A+(5A-15)=180}}}
{{{10A-15=180}}}
{{{10A=195}}}
{{{highlight( A=19.5)}}}
.
.
{{{B=4A}}}
{{{highlight(B=78)}}}
.
.
{{{C=5A-15}}}
{{{highlight( C=82.5)}}}