math help please

Question

At the city museum, child admission is 

$5.30

 and adult admission is 

$9.10

. On Monday, twice as many adult tickets as child tickets were sold, for a total sales of 

$470.00

. How many child tickets were sold that day?

Answer 1

x = number of child tickets at 5.30 each

2x = number of adult tickets at 9.10 each

5.30x + 9.10(2x) = 470

x = 470 / [5.30 + 2(9.10)] = 20

20 child tickets were sold, 40 adult tickets were sold.