An empty rectangular container has a capacity of 109 ℓ and a height of 20 cm. At 6 a.m., Tap D is turned on to fill the container at a rate of 8 ℓ per minute for 16 minutes. After 13 minutes, Tap E is turned on to drain water from the container at a rate of 7 ℓ per minute for 7 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 
7 ℓ = 7000 cm³ 
109 ℓ = 109000 cm³

Volume of water flowed in from Tap D
= 16 x 8000
= 128000 cm³

Volume of water from drained from Tap E
= 7 x 7000
= 49000 cm³

Volume of water left in the container
= 128000 - 49000
= 79000 cm³

Base area of the container
= 109000 ÷ 20
= 5450 cm² 

Height of water left in the container
= 79000 ÷ 5450
≈ 14.5 cm

Answer(s): 14.5 cm