Beverage Dispenser P and Beverage Dispenser Q have a total amount of 2463 mℓ of water. For Beverage Dispenser Q and Beverage Dispenser R, the total amount of water is 3081 mℓ. The amount of water in Beverage Dispenser P is ³₅ the amount of water in Beverage Dispenser R. What is the average amount of water in the 3 beverage dispensers?
Beverage Dispenser P = 3 u
Beverage Dispenser R = 5 u 

Beverage Dispenser Q + Beverage Dispenser P = 2463 --- (1)
Beverage Dispenser Q + Beverage Dispenser R = 3081 --- (2)

(2) - (1)
(Beverage Dispenser Q + Beverage Dispenser P) - (Beverage Dispenser Q + Beverage Dispenser R) = 3081 - 2463
5 u - 3 u = 618
2 u = 618

1 u = 618 ÷ 2 = 309
Beverage Dispenser P = 3 u = 309 x 3 = 927

Beverage Dispenser P + Beverage Dispenser Q + Beverage Dispenser R = 927 + 3081 = 4008 mℓ

Average amount of water in the 3 beverage dispensers
= 4008 ÷ 3 
= 1336 mℓ

Answer(s): 1336 mℓ