Question

Tickets to an amusement park are $60 for adults and $30 for children. If a is the number of adults and c is the number of children, write an expression that represents the cost for a adults and c children.

Answer 1

The expression is 60a + 30c. 
In this expression you add the two numbers together. Since it is an expression you don't solve it
Hope this helps! :D

Answer 2

Hey spookygoner ! 

So from what I understand, this is the answer (example)...

A1 + C2 = $120 

Meaning 1 Adults and 2 Children. 

Sorry if this isn't what you expected but that's what I understood. I hope I was able to help you out ! :D