An empty rectangular container has a capacity of 100 ℓ and a height of 25 cm. At 6 a.m., Tap Y is turned on to fill the container at a rate of 10 ℓ per minute for 19 minutes. After 3 minutes, Tap Z is turned on to drain water from the container at a rate of 4 ℓ per minute for 20 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 
10 ℓ = 10000 cm³ 
4 ℓ = 4000 cm³ 
100 ℓ = 100000 cm³

Volume of water flowed in from Tap Y
= 19 x 10000
= 190000 cm³

Volume of water from drained from Tap Z
= 20 x 4000
= 80000 cm³

Volume of water left in the container
= 190000 - 80000
= 110000 cm³

Base area of the container
= 100000 ÷ 25
= 4000 cm² 

Height of water left in the container
= 110000 ÷ 4000
≈ 27.5 cm

Answer(s): 27.5 cm