Fill in the blank to complete the sentence. Alan takes _ minutes to walk 240 yd, and waits for Brendon for _ minutes until they are together again. (Separate your answers with a comma)

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?