Beverage Dispenser K and Beverage Dispenser L have a total amount of 2631 mℓ of water. For Beverage Dispenser L and Beverage Dispenser M, the total amount of water is 3171 mℓ. The amount of water in Beverage Dispenser K is ²₅ the amount of water in Beverage Dispenser M. What is the average amount of water in the 3 beverage dispensers?
Beverage Dispenser K = 2 u
Beverage Dispenser M = 5 u 

Beverage Dispenser L + Beverage Dispenser K = 2631 --- (1)
Beverage Dispenser L + Beverage Dispenser M = 3171 --- (2)

(2) - (1)
(Beverage Dispenser L + Beverage Dispenser K) - (Beverage Dispenser L + Beverage Dispenser M) = 3171 - 2631
5 u - 2 u = 540
3 u = 540

1 u = 540 ÷ 3 = 180
Beverage Dispenser K = 2 u = 180 x 2 = 360

Beverage Dispenser K + Beverage Dispenser L + Beverage Dispenser M = 360 + 3171 = 3531 mℓ

Average amount of water in the 3 beverage dispensers
= 3531 ÷ 3 
= 1177 mℓ

Answer(s): 1177 mℓ