Question 1060221
Let m be the number of children at the festival, and n be adults. Then:
m+n=1130
and
1.5m+4n=2520
So:
4m+4n=4520
1.5m+4n=2520
2.5m=2000
m=800
n=330
There were 800 children and 330 adults at the festival. ☺☺☺☺