An empty rectangular container has a capacity of 85 ℓ and a height of 40 cm. At 9 a.m., Tap J is turned on to fill the container at a rate of 4 ℓ per minute for 19 minutes. After 4 minutes, Tap K 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 
4 ℓ = 4000 cm³ 
3 ℓ = 3000 cm³ 
85 ℓ = 85000 cm³

Volume of water flowed in from Tap J
= 19 x 4000
= 76000 cm³

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

Volume of water left in the container
= 76000 - 24000
= 52000 cm³

Base area of the container
= 85000 ÷ 40
= 2125 cm² 

Height of water left in the container
= 52000 ÷ 2125
≈ 24.5 cm

Answer(s): 24.5 cm