Beverage Dispenser Z and Beverage Dispenser A have a total amount of 1030 mℓ of water. For Beverage Dispenser A and Beverage Dispenser B, the total amount of water is 4777 mℓ. The amount of water in Beverage Dispenser Z is ²₅ the amount of water in Beverage Dispenser B. What is the average amount of water in the 3 beverage dispensers?
Beverage Dispenser Z = 2 u
Beverage Dispenser B = 5 u 

Beverage Dispenser A + Beverage Dispenser Z = 1030 --- (1)
Beverage Dispenser A + Beverage Dispenser B = 4777 --- (2)

(2) - (1)
(Beverage Dispenser A + Beverage Dispenser Z) - (Beverage Dispenser A + Beverage Dispenser B) = 4777 - 1030
5 u - 2 u = 3747
3 u = 3747

1 u = 3747 ÷ 3 = 1249
Beverage Dispenser Z = 2 u = 1249 x 2 = 2498

Beverage Dispenser Z + Beverage Dispenser A + Beverage Dispenser B = 2498 + 4777 = 7275 mℓ

Average amount of water in the 3 beverage dispensers
= 7275 ÷ 3 
= 2425 mℓ

Answer(s): 2425 mℓ