a box of 6 eggs cost 46p but a box of 12 eggs cost only 82p. If a total of 78 eggs are bought for a cost of £5.38, how many of each size box were bought?

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?