Siri can take no more than 22 pounds of luggage on a trip or suitcase weighs 112 oz is how many more pounds can she pack without going over the limit

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?