Cylinder D and Cylinder E have a total amount of 1883 mℓ of water. For Cylinder E and Cylinder F, the total amount of water is 3357 mℓ. The amount of water in Cylinder D is ³₅ the amount of water in Cylinder F. What is the average amount of water in the 3 cylinders?
Cylinder D = 3 u
Cylinder F = 5 u 

Cylinder E + Cylinder D = 1883 --- (1)
Cylinder E + Cylinder F = 3357 --- (2)

(2) - (1)
(Cylinder E + Cylinder D) - (Cylinder E + Cylinder F) = 3357 - 1883
5 u - 3 u = 1474
2 u = 1474

1 u = 1474 ÷ 2 = 737
Cylinder D = 3 u = 737 x 3 = 2211

Cylinder D + Cylinder E + Cylinder F = 2211 + 3357 = 5568 mℓ

Average amount of water in the 3 cylinders
= 5568 ÷ 3 
= 1856 mℓ

Answer(s): 1856 mℓ