An empty rectangular tank has a capacity of 96 ℓ and a height of 128 cm. At 6 a.m., Tap B is turned on to fill the tank at a rate of 9 ℓ per minute for 16 minutes. After 9 minutes, Tap C is turned on to drain water from the tank at a rate of 4 ℓ per minute for 29 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 
4 ℓ = 4000 cm³ 
96 ℓ = 96000 cm³

Volume of water flowed in from Tap B
= 16 x 9000
= 144000 cm³

Volume of water from drained from Tap C
= 29 x 4000
= 116000 cm³

Volume of water left in the tank
= 144000 - 116000
= 28000 cm³

Base area of the tank
= 96000 ÷ 128
= 750 cm² 

Height of water left in the tank
= 28000 ÷ 750
≈ 37.3 cm

Answer(s): 37.3 cm