On Sunday, 370 people bought tickets to the county fair. Tickets cost $7 for
adults and $3 for children. The total revenue from ticket sales on Sunday was
$1750. The system of equations below represents the number of people and
total sales for the county fair on Sunday, where x represents the number of
child tickets and y represents the number of adult tickets.
x+y=370
3x+7y=1750
How many child tickets were sold on Sunday?
OA. 180
B. 160
C. 210
D. 220