Urgent! : which property justifies this statement?     if x + y = z and z = x + 4, then x + y = x + 4.   a. symmetric   b. distributive   c. transitive   d. associative

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?