An empty rectangular tank has a capacity of 26 ℓ and a height of 13 cm. At 9 a.m., Tap M is turned on to fill the tank at a rate of 9 ℓ per minute for 19 minutes. After 15 minutes, Tap N is turned on to drain water from the tank at a rate of 8 ℓ per minute for 10 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 
8 ℓ = 8000 cm³ 
26 ℓ = 26000 cm³

Volume of water flowed in from Tap M
= 19 x 9000
= 171000 cm³

Volume of water from drained from Tap N
= 10 x 8000
= 80000 cm³

Volume of water left in the tank
= 171000 - 80000
= 91000 cm³

Base area of the tank
= 26000 ÷ 13
= 2000 cm² 

Height of water left in the tank
= 91000 ÷ 2000
≈ 45.5 cm

Answer(s): 45.5 cm