An empty rectangular container has a capacity of 116 ℓ and a height of 10 cm. At 9 a.m., Tap V is turned on to fill the container at a rate of 9 ℓ per minute for 18 minutes. After 14 minutes, Tap W is turned on to drain water from the container at a rate of 3 ℓ per minute for 22 minutes. What is the height of the water level in the container in the end? Give the answer in 1 decimal place.
1 ℓ = 1000 cm³ 
9 ℓ = 9000 cm³ 
3 ℓ = 3000 cm³ 
116 ℓ = 116000 cm³

Volume of water flowed in from Tap V
= 18 x 9000
= 162000 cm³

Volume of water from drained from Tap W
= 22 x 3000
= 66000 cm³

Volume of water left in the container
= 162000 - 66000
= 96000 cm³

Base area of the container
= 116000 ÷ 10
= 11600 cm² 

Height of water left in the container
= 96000 ÷ 11600
≈ 8.3 cm

Answer(s): 8.3 cm