At the movie theatre, child admission is 5.50 and adult admission is 8.90. On Tuesday, 150 tickets were sold for a total sales of 1051.80. How many child tickets were sold that day?

Answer 1

a + c = 150
8.9a + 5.5c = 1051.80

I would change the first equation to c = 150-a , and use substitution.

I just did that and , unless I made an error, I did not get a whole number
as I must.