An empty rectangular tank has a capacity of 66 ℓ and a height of 55 cm. At 9 a.m., Tap A is turned on to fill the tank at a rate of 6 ℓ per minute for 18 minutes. After 8 minutes, Tap B is turned on to drain water from the tank at a rate of 2 ℓ per minute for 14 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 
6 ℓ = 6000 cm³ 
2 ℓ = 2000 cm³ 
66 ℓ = 66000 cm³

Volume of water flowed in from Tap A
= 18 x 6000
= 108000 cm³

Volume of water from drained from Tap B
= 14 x 2000
= 28000 cm³

Volume of water left in the tank
= 108000 - 28000
= 80000 cm³

Base area of the tank
= 66000 ÷ 55
= 1200 cm² 

Height of water left in the tank
= 80000 ÷ 1200
≈ 66.7 cm

Answer(s): 66.7 cm