Step-by-step explanation:
500 = n of tickets for both children and adults
a = adults
c = children
500 = a + c
a = 500 - c
(2 × c )+ (5 × a) = 1600
a = 500- c
2c + (5 × ( 500- c )) = 1600
2c + 2500 - 5c = 1600
- 3c = 1600 - 2500
- 3c = - 900
c = 300
300 ticket for children
a = 200 ticket for adults
