An empty rectangular container has a capacity of 147 ℓ and a height of 100 cm. At 9 a.m., Tap P is turned on to fill the container at a rate of 3 ℓ per minute for 19 minutes. After 4 minutes, Tap Q is turned on to drain water from the container at a rate of 3 ℓ per minute for 8 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 
3 ℓ = 3000 cm³ 
3 ℓ = 3000 cm³ 
147 ℓ = 147000 cm³

Volume of water flowed in from Tap P
= 19 x 3000
= 57000 cm³

Volume of water from drained from Tap Q
= 8 x 3000
= 24000 cm³

Volume of water left in the container
= 57000 - 24000
= 33000 cm³

Base area of the container
= 147000 ÷ 100
= 1470 cm² 

Height of water left in the container
= 33000 ÷ 1470
≈ 22.4 cm

Answer(s): 22.4 cm