How many adult tickets were sold that day?

Question

At the movie theatre, child admission is 5.30 and adult admission is 9.30 . On Tuesday, tickets were sold for a total sales of 1071 . How many adult tickets were sold that day?

Answer 1

5.3C + 9.3A = 1071, but that's as good as you can do without more information

9.3A = 1071 - 5.3C

A = adult tickets = 1071/9.3 - (5.3/9.3)C If you don't know child sales, you can't calculate adult sales.