lower box = x
upper box = y
x+y=137
x=137-y
12.50x + 10y=1502.50
12.50(137-y) + 10y=1502.50
1712.5-12.50y+10y=1502.50
1712.5-2.50y=1502.50
-2.5y=-210
y=-210/-2.50 = 84
y = 84
x=137-84=53
53 lower box tickets
84 upper box tickets
9.5m questions
12.2m answers