Cylinder G and Cylinder H have a total amount of 2912 mℓ of water. For Cylinder H and Cylinder J, the total amount of water is 3660 mℓ. The amount of water in Cylinder G is ³₅ the amount of water in Cylinder J. What is the average amount of water in the 3 cylinders?
Cylinder G = 3 u
Cylinder J = 5 u 

Cylinder H + Cylinder G = 2912 --- (1)
Cylinder H + Cylinder J = 3660 --- (2)

(2) - (1)
(Cylinder H + Cylinder G) - (Cylinder H + Cylinder J) = 3660 - 2912
5 u - 3 u = 748
2 u = 748

1 u = 748 ÷ 2 = 374
Cylinder G = 3 u = 374 x 3 = 1122

Cylinder G + Cylinder H + Cylinder J = 1122 + 3660 = 4782 mℓ

Average amount of water in the 3 cylinders
= 4782 ÷ 3 
= 1594 mℓ

Answer(s): 1594 mℓ