8 identical 7-cm cubes are placed in an empty rectangular tank of length 76 cm and width 30 cm. The tank is then filled with water from a tap flowing at a rate of 10 litres per minute. It takes 9 minutes to fill up ²₅ of the tank. What is the height of the tank? Correct your answer to 1 decimal place.
Volume of 1 cube
= 7 x 7 x 7
= 343 cm³ 

Volume of 8 cubes
= 8 x 343
= 2744 cm³ 

1 ℓ = 1000 mℓ
10 ℓ = 10000 mℓ

Volume of water in the tank
= 9 x 10000
= 90000 mℓ

Volume of ²₅ of the tank
= 90000 + 2744
= 92744 mℓ

Volume of the tank
= 92744 ÷ ²₅
= 92744 x ⁵₂
= 231860 mℓ

Base area
= 76 x 30
= 2280 cm² 

Height of the tank
= 231860 ÷ 2280
≈ 101.7 cm

Answer(s): 101.7 cm