An empty rectangular tank has a capacity of 173 ℓ and a height of 50 cm. At 10 a.m., Tap K is turned on to fill the tank at a rate of 7 ℓ per minute for 19 minutes. After 2 minutes, Tap L is turned on to drain water from the tank at a rate of 7 ℓ per minute for 7 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 
7 ℓ = 7000 cm³ 
173 ℓ = 173000 cm³

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

Volume of water from drained from Tap L
= 7 x 7000
= 49000 cm³

Volume of water left in the tank
= 133000 - 49000
= 84000 cm³

Base area of the tank
= 173000 ÷ 50
= 3460 cm² 

Height of water left in the tank
= 84000 ÷ 3460
≈ 24.3 cm

Answer(s): 24.3 cm