An empty rectangular container has a capacity of 93 ℓ and a height of 25 cm. At 10 a.m., Tap Y is turned on to fill the container at a rate of 10 ℓ per minute for 18 minutes. After 8 minutes, Tap Z is turned on to drain water from the container at a rate of 5 ℓ per minute for 13 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 
5 ℓ = 5000 cm³ 
93 ℓ = 93000 cm³

Volume of water flowed in from Tap Y
= 18 x 10000
= 180000 cm³

Volume of water from drained from Tap Z
= 13 x 5000
= 65000 cm³

Volume of water left in the container
= 180000 - 65000
= 115000 cm³

Base area of the container
= 93000 ÷ 25
= 3720 cm² 

Height of water left in the container
= 115000 ÷ 3720
≈ 30.9 cm

Answer(s): 30.9 cm