An empty rectangular tank has a capacity of 44 ℓ and a height of 110 cm. At 8 a.m., Tap Y is turned on to fill the tank at a rate of 7 ℓ per minute for 17 minutes. After 12 minutes, Tap Z is turned on to drain water from the tank at a rate of 7 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 
7 ℓ = 7000 cm³ 
7 ℓ = 7000 cm³ 
44 ℓ = 44000 cm³

Volume of water flowed in from Tap Y
= 17 x 7000
= 119000 cm³

Volume of water from drained from Tap Z
= 10 x 7000
= 70000 cm³

Volume of water left in the tank
= 119000 - 70000
= 49000 cm³

Base area of the tank
= 44000 ÷ 110
= 400 cm² 

Height of water left in the tank
= 49000 ÷ 400
≈ 122.5 cm

Answer(s): 122.5 cm