An empty rectangular tank has a capacity of 164 ℓ and a height of 25 cm. At 10 a.m., Tap V is turned on to fill the tank at a rate of 9 ℓ per minute for 20 minutes. After 5 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 
9 ℓ = 9000 cm³ 
3 ℓ = 3000 cm³ 
164 ℓ = 164000 cm³

Volume of water flowed in from Tap V
= 20 x 9000
= 180000 cm³

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

Volume of water left in the tank
= 180000 - 75000
= 105000 cm³

Base area of the tank
= 164000 ÷ 25
= 6560 cm² 

Height of water left in the tank
= 105000 ÷ 6560
≈ 16 cm

Answer(s): 16 cm