A trough whose cross-section is given on the right is 10 m long. If AB and ED are vertical, and AE is horizontal, find the amount of water it can hold when full.

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?