Charlie bought 16 cartons of ice cream and 7 cartons of yogurt. each carton of ice cream cost $6 and each carton of yogurt cost $1. how much more did charlie spend on ice cream than on yogurt?

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?