Cylinder T and Cylinder U have a total amount of 1404 mℓ of water. For Cylinder U and Cylinder V, the total amount of water is 4185 mℓ. The amount of water in Cylinder T is ⁵₈ the amount of water in Cylinder V. What is the average amount of water in the 3 cylinders?
Cylinder T = 5 u
Cylinder V = 8 u 

Cylinder U + Cylinder T = 1404 --- (1)
Cylinder U + Cylinder V = 4185 --- (2)

(2) - (1)
(Cylinder U + Cylinder T) - (Cylinder U + Cylinder V) = 4185 - 1404
8 u - 5 u = 2781
3 u = 2781

1 u = 2781 ÷ 3 = 927
Cylinder T = 5 u = 927 x 5 = 4635

Cylinder T + Cylinder U + Cylinder V = 4635 + 4185 = 8820 mℓ

Average amount of water in the 3 cylinders
= 8820 ÷ 3 
= 2940 mℓ

Answer(s): 2940 mℓ