Answer:
470
Step-by-step explanation:
Let a be adult at premiere.
Let c be children at premiere.
Equation 1:- a + c = 600
Let 13a be total price of tickets for adults.
Let 2c be total price of tickets for children.
Equation 2:- 13a + 2c = 2630
Solve simultaneously for c to determine children at premiere.
Make c the subject from Equation 1 to get Equation 3.
Equation 3:- c = 600 - a
Substitute c's value in Equation 3 in Equation 2
13a + 2 (600 - a) = 2630
13a + 1200 -2a = 2630
11a = 2630 -1200
11a = 1430
a = 130
Substitute value of a in Equation 3
c = 600 - 130
c = 470
