An empty rectangular tank has a capacity of 148 ℓ and a height of 32 cm. At 8 a.m., Tap U is turned on to fill the tank at a rate of 8 ℓ per minute for 20 minutes. After 4 minutes, Tap V is turned on to drain water from the tank at a rate of 4 ℓ per minute for 24 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 
4 ℓ = 4000 cm³ 
148 ℓ = 148000 cm³

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

Volume of water from drained from Tap V
= 24 x 4000
= 96000 cm³

Volume of water left in the tank
= 160000 - 96000
= 64000 cm³

Base area of the tank
= 148000 ÷ 32
= 4625 cm² 

Height of water left in the tank
= 64000 ÷ 4625
≈ 13.8 cm

Answer(s): 13.8 cm