An empty rectangular container has a capacity of 109 ℓ and a height of 50 cm. At 7 a.m., Tap K is turned on to fill the container at a rate of 8 ℓ per minute for 20 minutes. After 8 minutes, Tap L is turned on to drain water from the container at a rate of 6 ℓ per minute for 13 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 
8 ℓ = 8000 cm³ 
6 ℓ = 6000 cm³ 
109 ℓ = 109000 cm³

Volume of water flowed in from Tap K
= 20 x 8000
= 160000 cm³

Volume of water from drained from Tap L
= 13 x 6000
= 78000 cm³

Volume of water left in the container
= 160000 - 78000
= 82000 cm³

Base area of the container
= 109000 ÷ 50
= 2180 cm² 

Height of water left in the container
= 82000 ÷ 2180
≈ 37.6 cm

Answer(s): 37.6 cm