An empty rectangular tank has a capacity of 108 ℓ and a height of 50 cm. At 8 a.m., Tap U is turned on to fill the tank at a rate of 10 ℓ per minute for 19 minutes. After 11 minutes, Tap V is turned on to drain water from the tank at a rate of 3 ℓ per minute for 6 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 
10 ℓ = 10000 cm³ 
3 ℓ = 3000 cm³ 
108 ℓ = 108000 cm³

Volume of water flowed in from Tap U
= 19 x 10000
= 190000 cm³

Volume of water from drained from Tap V
= 6 x 3000
= 18000 cm³

Volume of water left in the tank
= 190000 - 18000
= 172000 cm³

Base area of the tank
= 108000 ÷ 50
= 2160 cm² 

Height of water left in the tank
= 172000 ÷ 2160
≈ 79.6 cm

Answer(s): 79.6 cm