An empty rectangular container has a capacity of 110 ℓ and a height of 25 cm. At 10 a.m., Tap C is turned on to fill the container at a rate of 7 ℓ per minute for 19 minutes. After 9 minutes, Tap D is turned on to drain water from the container at a rate of 8 ℓ per minute for 10 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 
7 ℓ = 7000 cm³ 
8 ℓ = 8000 cm³ 
110 ℓ = 110000 cm³

Volume of water flowed in from Tap C
= 19 x 7000
= 133000 cm³

Volume of water from drained from Tap D
= 10 x 8000
= 80000 cm³

Volume of water left in the container
= 133000 - 80000
= 53000 cm³

Base area of the container
= 110000 ÷ 25
= 4400 cm² 

Height of water left in the container
= 53000 ÷ 4400
≈ 12 cm

Answer(s): 12 cm