Beverage Dispenser W and Beverage Dispenser X have a total amount of 2020 mℓ of water. For Beverage Dispenser X and Beverage Dispenser Y, the total amount of water is 2998 mℓ. The amount of water in Beverage Dispenser W is ⁴₇ the amount of water in Beverage Dispenser Y. What is the average amount of water in the 3 beverage dispensers?
Beverage Dispenser W = 4 u
Beverage Dispenser Y = 7 u 

Beverage Dispenser X + Beverage Dispenser W = 2020 --- (1)
Beverage Dispenser X + Beverage Dispenser Y = 2998 --- (2)

(2) - (1)
(Beverage Dispenser X + Beverage Dispenser W) - (Beverage Dispenser X + Beverage Dispenser Y) = 2998 - 2020
7 u - 4 u = 978
3 u = 978

1 u = 978 ÷ 3 = 326
Beverage Dispenser W = 4 u = 326 x 4 = 1304

Beverage Dispenser W + Beverage Dispenser X + Beverage Dispenser Y = 1304 + 2998 = 4302 mℓ

Average amount of water in the 3 beverage dispensers
= 4302 ÷ 3 
= 1434 mℓ

Answer(s): 1434 mℓ