An empty rectangular tank has a capacity of 49 ℓ and a height of 100 cm. At 8 a.m., Tap V is turned on to fill the tank at a rate of 4 ℓ per minute for 16 minutes. After 6 minutes, Tap W is turned on to drain water from the tank at a rate of 8 ℓ per minute for 5 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 
4 ℓ = 4000 cm³ 
8 ℓ = 8000 cm³ 
49 ℓ = 49000 cm³

Volume of water flowed in from Tap V
= 16 x 4000
= 64000 cm³

Volume of water from drained from Tap W
= 5 x 8000
= 40000 cm³

Volume of water left in the tank
= 64000 - 40000
= 24000 cm³

Base area of the tank
= 49000 ÷ 100
= 490 cm² 

Height of water left in the tank
= 24000 ÷ 490
≈ 49 cm

Answer(s): 49 cm