Cylinder Y and Cylinder Z have a total amount of 2869 mℓ of water. For Cylinder Z and Cylinder A, the total amount of water is 4974 mℓ. The amount of water in Cylinder Y is ³₈ the amount of water in Cylinder A. What is the average amount of water in the 3 cylinders?
Cylinder Y = 3 u
Cylinder A = 8 u 

Cylinder Z + Cylinder Y = 2869 --- (1)
Cylinder Z + Cylinder A = 4974 --- (2)

(2) - (1)
(Cylinder Z + Cylinder Y) - (Cylinder Z + Cylinder A) = 4974 - 2869
8 u - 3 u = 2105
5 u = 2105

1 u = 2105 ÷ 5 = 421
Cylinder Y = 3 u = 421 x 3 = 1263

Cylinder Y + Cylinder Z + Cylinder A = 1263 + 4974 = 6237 mℓ

Average amount of water in the 3 cylinders
= 6237 ÷ 3 
= 2079 mℓ

Answer(s): 2079 mℓ