If the sum of three consecutive odd integers is at most 216, what is the largest possible value of one of these interfere? 69, 71, 73, 74

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?