Question

At the city museum, child admission is $5.20 and adult admission is $9.90. On Wednesday, three times as many Adult tickets to child tickets were sold, for a total sales of $767.80. How many child tickets were sold that day

Answer 1

Child=x
Adult=y
y=3x
5.2x+9.9y=767.8
5.2x+9.9(3x)=767.8
5.2x+29.7x=767.8
34.9x=767.8
x=22