An empty rectangular container has a capacity of 98 ℓ and a height of 25 cm. At 7 a.m., Tap Q is turned on to fill the container at a rate of 9 ℓ per minute for 17 minutes. After 14 minutes, Tap R is turned on to drain water from the container at a rate of 8 ℓ per minute for 6 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 
9 ℓ = 9000 cm³ 
8 ℓ = 8000 cm³ 
98 ℓ = 98000 cm³

Volume of water flowed in from Tap Q
= 17 x 9000
= 153000 cm³

Volume of water from drained from Tap R
= 6 x 8000
= 48000 cm³

Volume of water left in the container
= 153000 - 48000
= 105000 cm³

Base area of the container
= 98000 ÷ 25
= 3920 cm² 

Height of water left in the container
= 105000 ÷ 3920
≈ 26.8 cm

Answer(s): 26.8 cm