An empty rectangular tank has a capacity of 132 ℓ and a height of 40 cm. At 6 a.m., Tap U is turned on to fill the tank at a rate of 7 ℓ per minute for 19 minutes. After 12 minutes, Tap V is turned on to drain water from the tank at a rate of 5 ℓ per minute for 19 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 
7 ℓ = 7000 cm³ 
5 ℓ = 5000 cm³ 
132 ℓ = 132000 cm³

Volume of water flowed in from Tap U
= 19 x 7000
= 133000 cm³

Volume of water from drained from Tap V
= 19 x 5000
= 95000 cm³

Volume of water left in the tank
= 133000 - 95000
= 38000 cm³

Base area of the tank
= 132000 ÷ 40
= 3300 cm² 

Height of water left in the tank
= 38000 ÷ 3300
≈ 11.5 cm

Answer(s): 11.5 cm