An empty rectangular container has a capacity of 147 ℓ and a height of 15 cm. At 9 a.m., Tap Z is turned on to fill the container at a rate of 7 ℓ per minute for 15 minutes. After 12 minutes, Tap A is turned on to drain water from the container at a rate of 9 ℓ per minute for 9 minutes. What is the height of the water level in the container in the end? Give the answer in 1 decimal place.
1 ℓ = 1000 cm³ 
7 ℓ = 7000 cm³ 
9 ℓ = 9000 cm³ 
147 ℓ = 147000 cm³

Volume of water flowed in from Tap Z
= 15 x 7000
= 105000 cm³

Volume of water from drained from Tap A
= 9 x 9000
= 81000 cm³

Volume of water left in the container
= 105000 - 81000
= 24000 cm³

Base area of the container
= 147000 ÷ 15
= 9800 cm² 

Height of water left in the container
= 24000 ÷ 9800
≈ 2.4 cm

Answer(s): 2.4 cm