Cylinder E and Cylinder F have a total amount of 1074 mℓ of water. For Cylinder F and Cylinder G, the total amount of water is 4818 mℓ. The amount of water in Cylinder E is ²₅ the amount of water in Cylinder G. What is the average amount of water in the 3 cylinders?
Cylinder E = 2 u
Cylinder G = 5 u 

Cylinder F + Cylinder E = 1074 --- (1)
Cylinder F + Cylinder G = 4818 --- (2)

(2) - (1)
(Cylinder F + Cylinder E) - (Cylinder F + Cylinder G) = 4818 - 1074
5 u - 2 u = 3744
3 u = 3744

1 u = 3744 ÷ 3 = 1248
Cylinder E = 2 u = 1248 x 2 = 2496

Cylinder E + Cylinder F + Cylinder G = 2496 + 4818 = 7314 mℓ

Average amount of water in the 3 cylinders
= 7314 ÷ 3 
= 2438 mℓ

Answer(s): 2438 mℓ