Answer:
170 children and 160 adults
Step-by-step explanation:
a = no of adults
c = no of children
a + c = 330
3a + c = 650
2a = 320
a = 160 adults
160 + c = 330
c = 170 children
160a and 170c
3*160+1*170=650
480+170=650
650=650
