An empty rectangular container has a capacity of 107 ℓ and a height of 25 cm. At 9 a.m., Tap V is turned on to fill the container at a rate of 8 ℓ per minute for 17 minutes. After 7 minutes, Tap W is turned on to drain water from the container at a rate of 3 ℓ per minute for 21 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 
3 ℓ = 3000 cm³ 
107 ℓ = 107000 cm³

Volume of water flowed in from Tap V
= 17 x 8000
= 136000 cm³

Volume of water from drained from Tap W
= 21 x 3000
= 63000 cm³

Volume of water left in the container
= 136000 - 63000
= 73000 cm³

Base area of the container
= 107000 ÷ 25
= 4280 cm² 

Height of water left in the container
= 73000 ÷ 4280
≈ 17.1 cm

Answer(s): 17.1 cm