Question 356890
x+y=2200  ------> y = 2200-x
1.5x+4y=5050 



1.5x+4y=5050 
15x+40y=50500
15x+40(2200-x)=50500
15x+88000-40x=50500
-25x+88000=50500
-25x=50500-88000
-25x=37500
x=1500  ------> 1500 kids


y=2200-x=2200-1500 = 700
y = 700 ----> 700 adults