At the city museum, child admission is

$5.80

and adult admission is

$9.00

. On Wednesday,

149

tickets were sold for a total sales of

$1056.20

. How many adult tickets were sold that day?

We have a system of equations here:

Let 'a' = adult tickets and 'c' = children's tickets

5.80c + 9.00a = 1056.20

We also know that the total number of tickets (adults and children) was 149:

a + c = 149

We need only solve the system.