Beverage Dispenser Q and Beverage Dispenser R have a total amount of 3209 mℓ of water. For Beverage Dispenser R and Beverage Dispenser S, the total amount of water is 4314 mℓ. The amount of water in Beverage Dispenser Q is ³₈ the amount of water in Beverage Dispenser S. What is the average amount of water in the 3 beverage dispensers?
Beverage Dispenser Q = 3 u
Beverage Dispenser S = 8 u 

Beverage Dispenser R + Beverage Dispenser Q = 3209 --- (1)
Beverage Dispenser R + Beverage Dispenser S = 4314 --- (2)

(2) - (1)
(Beverage Dispenser R + Beverage Dispenser Q) - (Beverage Dispenser R + Beverage Dispenser S) = 4314 - 3209
8 u - 3 u = 1105
5 u = 1105

1 u = 1105 ÷ 5 = 221
Beverage Dispenser Q = 3 u = 221 x 3 = 663

Beverage Dispenser Q + Beverage Dispenser R + Beverage Dispenser S = 663 + 4314 = 4977 mℓ

Average amount of water in the 3 beverage dispensers
= 4977 ÷ 3 
= 1659 mℓ

Answer(s): 1659 mℓ