Sophia has 64 jazz CDs and 80 rock CDs. Is the ratio of jazz CDs to rock CDs 3 : 4 or 4 : 5?

Sophia wrote an equation to represent the revenue of a movie theater for one day. she let x represent the number of child tickets sold and y represents the nunver of adult tickets sold. if a child ticket cost $4, an adult ticket cost $6, and the total revenue for the daybwas $420, which equation could sophia use to represent the number of chikd and adult tickets that were sold?