Question 1016343
{{{A[1]+A[2]=180}}}
{{{A[1]=2*A[2]-15}}}
Substituting,
{{{2*A[2]-15+A[2]=180}}}
{{{3A[2]=195}}}
{{{A[2]=65}}}
Then,
{{{A[1]+65=180}}}
{{{A[1]=115}}}