An empty rectangular container has a capacity of 188 ℓ and a height of 25 cm. At 6 a.m., Tap M is turned on to fill the container at a rate of 9 ℓ per minute for 19 minutes. After 7 minutes, Tap N is turned on to drain water from the container at a rate of 6 ℓ per minute for 19 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 
6 ℓ = 6000 cm³ 
188 ℓ = 188000 cm³

Volume of water flowed in from Tap M
= 19 x 9000
= 171000 cm³

Volume of water from drained from Tap N
= 19 x 6000
= 114000 cm³

Volume of water left in the container
= 171000 - 114000
= 57000 cm³

Base area of the container
= 188000 ÷ 25
= 7520 cm² 

Height of water left in the container
= 57000 ÷ 7520
≈ 7.6 cm

Answer(s): 7.6 cm