Asix grade teacher can grade 25 homework assignments in 20 minutes. is he working at a faster rate or a slower rate then grading 36 homework assignments in 30 minutesa sixth grade math teacher can grade 25 homework assignments in 20 minutes is he working at a faster rate or slower rate than grading 36 homework assignments in 30 minutes

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?