An empty rectangular container has a capacity of 128 ℓ and a height of 32 cm. At 9 a.m., Tap H is turned on to fill the container at a rate of 10 ℓ per minute for 17 minutes. After 4 minutes, Tap J is turned on to drain water from the container at a rate of 6 ℓ per minute for 10 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 
10 ℓ = 10000 cm³ 
6 ℓ = 6000 cm³ 
128 ℓ = 128000 cm³

Volume of water flowed in from Tap H
= 17 x 10000
= 170000 cm³

Volume of water from drained from Tap J
= 10 x 6000
= 60000 cm³

Volume of water left in the container
= 170000 - 60000
= 110000 cm³

Base area of the container
= 128000 ÷ 32
= 4000 cm² 

Height of water left in the container
= 110000 ÷ 4000
≈ 27.5 cm

Answer(s): 27.5 cm