Question 111859
There's one little problem: the second equation {{{13x + 10y=22}}} represents the total sales (the left side is the sum of the amount of money made and the right side is the total  money). So the second equation should be

{{{13x + 10y=277}}}



*[invoke solving_linear_system_by_elimination 1,1,22,13,10,277] 


So this means there were 19 adults and 3 children at the play