Question 1011828
Since all the angles sum to 180,
{{{x+20+2x+7x+10=180}}}
{{{10x+30=180}}}
{{{10x=150}}}
{{{x=15}}}
So now find each angle,
{{{x+20=15+20=35}}}
{{{2x=2(15)=30}}}
{{{7x+10=7(15)+10=105+10=115}}}
The largest angle would be 115.