An empty rectangular tank has a capacity of 115 ℓ and a height of 20 cm. At 7 a.m., Tap V is turned on to fill the tank at a rate of 8 ℓ per minute for 17 minutes. After 7 minutes, Tap W is turned on to drain water from the tank at a rate of 3 ℓ per minute for 25 minutes. What is the height of the water level in the tank in the end? Give the answer in 1 decimal place.
1 ℓ = 1000 cm³ 
8 ℓ = 8000 cm³ 
3 ℓ = 3000 cm³ 
115 ℓ = 115000 cm³

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

Volume of water from drained from Tap W
= 25 x 3000
= 75000 cm³

Volume of water left in the tank
= 136000 - 75000
= 61000 cm³

Base area of the tank
= 115000 ÷ 20
= 5750 cm² 

Height of water left in the tank
= 61000 ÷ 5750
≈ 10.6 cm

Answer(s): 10.6 cm