Answer:
The cost of a child ticket is $6.91 and an adult ticket is $11.32.
Explanation:
Given:
A family of 2 adults and 3 children go to the movies.
Adult tickets are $2.50 less than twice a children's ticket.
The total of the bill is $47.75.
Now, to find the costs of each ticket.
Let the cost of a child ticket be

So, the cost of an adult ticket =
.
Family of 2 adults and 3 children go to the movies.
The total of the bill is $47.75.
Now, to get the costs of each ticket:



Adding both sides by 7.50 we get:


The cost of child ticket = $6.91.
Now, to get the cost of adult ticket by substituting the value of
:

The cost of adult ticket = $11.32.
Therefore, the cost of a child ticket is $6.91 and an adult ticket is $11.32.