Answer:
236 for children and 288 for adults
Explanation:
→ Set up 2 simultaneous equations
a + c = 524
2.25a + 1.25c = 891
→ Multiply 1st equation by 1.25
1.25a + 1.25c = 655
2.25a + 1.25c = 891
→ Minus from each other
-a = -236 ⇔ a = 236
→ Substitute into first equation
236 + c = 524 ⇔ c = 288