Cylinder C and Cylinder D have a total amount of 4106 mℓ of water. For Cylinder D and Cylinder E, the total amount of water is 4536 mℓ. The amount of water in Cylinder C is ³₈ the amount of water in Cylinder E. What is the average amount of water in the 3 cylinders?
Cylinder C = 3 u
Cylinder E = 8 u 

Cylinder D + Cylinder C = 4106 --- (1)
Cylinder D + Cylinder E = 4536 --- (2)

(2) - (1)
(Cylinder D + Cylinder C) - (Cylinder D + Cylinder E) = 4536 - 4106
8 u - 3 u = 430
5 u = 430

1 u = 430 ÷ 5 = 86
Cylinder C = 3 u = 86 x 3 = 258

Cylinder C + Cylinder D + Cylinder E = 258 + 4536 = 4794 mℓ

Average amount of water in the 3 cylinders
= 4794 ÷ 3 
= 1598 mℓ

Answer(s): 1598 mℓ