A university theatre sold 478 tickets for a play. The tickets cost $20 per adult and $13 per senior citizen. If the total reciepts were $6970, how many senior-citizen tickets were sold?
I already know the answer as this is just a math final review question, I just want to know how to set this up so I can study it better.
I already know the answer as this is just a math final review question, I just want to know how to set this up so I can study it better.