Cylinder K and Cylinder L have a total amount of 3783 mℓ of water. For Cylinder L and Cylinder M, the total amount of water is 3891 mℓ. The amount of water in Cylinder K is ⁵₈ the amount of water in Cylinder M. What is the average amount of water in the 3 cylinders?
Cylinder K = 5 u
Cylinder M = 8 u 

Cylinder L + Cylinder K = 3783 --- (1)
Cylinder L + Cylinder M = 3891 --- (2)

(2) - (1)
(Cylinder L + Cylinder K) - (Cylinder L + Cylinder M) = 3891 - 3783
8 u - 5 u = 108
3 u = 108

1 u = 108 ÷ 3 = 36
Cylinder K = 5 u = 36 x 5 = 180

Cylinder K + Cylinder L + Cylinder M = 180 + 3891 = 4071 mℓ

Average amount of water in the 3 cylinders
= 4071 ÷ 3 
= 1357 mℓ

Answer(s): 1357 mℓ