One number is 8 more than twice then other number. Their sum is. 20

A50% increase followed by 33 1/2% decrease

Pls the last one and it has to be like number 6

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?