Let's call X the number of adults and Y the number of children
if the theater contains 447 seats, the first equation is:
X + Y = 447
Additionally, ticket prices were $59 for adults and $50 for children and the total proceeds are 14,977, so, the second equation is:
59X + 50Y = 14977
Solving for Y on the first equation and replacing on the second we get:
Solving for X, we get: