Question 1135347
y, price for adults
x, price for children


{{{system(50x+50y=800,75x+65y=1100)}}}


{{{system(x+y=16,15x+13y=220)}}}


{{{15*E1}}}:
{{{system(15x+15y=240,15x+13y=220)}}}


{{{E1-E2}}}:
{{{2y=20}}}
{{{highlight(y=10)}}}