Alexander and leandro purchase to montini movie tickets american and ticket cost $6.50 a drink cost $5.50 and a bag of popcorn cost $6

Becca wants to mix fruit juice and soda to make a punch. she can buy fruit juice for $3 a gallon and soda for $4 a gallon. if she wants to make 28 gallons of punch at a cost of $3.25 a gallon, how many gallons of fruit juice and how many gallons of soda should she buy?