An empty rectangular tank has a capacity of 89 ℓ and a height of 25 cm. At 8 a.m., Tap G is turned on to fill the tank at a rate of 7 ℓ per minute for 16 minutes. After 15 minutes, Tap H is turned on to drain water from the tank at a rate of 6 ℓ per minute for 14 minutes. What is the height of the water level in the tank in the end? Give the answer in 1 decimal place.
1 ℓ = 1000 cm³ 
7 ℓ = 7000 cm³ 
6 ℓ = 6000 cm³ 
89 ℓ = 89000 cm³

Volume of water flowed in from Tap G
= 16 x 7000
= 112000 cm³

Volume of water from drained from Tap H
= 14 x 6000
= 84000 cm³

Volume of water left in the tank
= 112000 - 84000
= 28000 cm³

Base area of the tank
= 89000 ÷ 25
= 3560 cm² 

Height of water left in the tank
= 28000 ÷ 3560
≈ 7.9 cm

Answer(s): 7.9 cm