Question 318974
{{{A+S=180}}}
{{{A=2S-10}}}
Substitute,
{{{2S-10+S=180}}}
{{{3S=190}}}
{{{highlight(S=190/3)}}}
Then,
{{{A=380/3-10}}}
{{{A=380/3-30/3}}}
{{{highlight(A=350/3)}}}