Beverage Dispenser A and Beverage Dispenser B have a total amount of 3349 mℓ of water. For Beverage Dispenser B and Beverage Dispenser C, the total amount of water is 3640 mℓ. The amount of water in Beverage Dispenser A is ²₅ the amount of water in Beverage Dispenser C. What is the average amount of water in the 3 beverage dispensers?
Beverage Dispenser A = 2 u
Beverage Dispenser C = 5 u 

Beverage Dispenser B + Beverage Dispenser A = 3349 --- (1)
Beverage Dispenser B + Beverage Dispenser C = 3640 --- (2)

(2) - (1)
(Beverage Dispenser B + Beverage Dispenser A) - (Beverage Dispenser B + Beverage Dispenser C) = 3640 - 3349
5 u - 2 u = 291
3 u = 291

1 u = 291 ÷ 3 = 97
Beverage Dispenser A = 2 u = 97 x 2 = 194

Beverage Dispenser A + Beverage Dispenser B + Beverage Dispenser C = 194 + 3640 = 3834 mℓ

Average amount of water in the 3 beverage dispensers
= 3834 ÷ 3 
= 1278 mℓ

Answer(s): 1278 mℓ