4 identical 9-cm cubes are placed in an empty rectangular tank of length 75 cm and width 29 cm. The tank is then filled with water from a tap flowing at a rate of 7 litres per minute. It takes 11 minutes to fill up ¹₅ of the tank. What is the height of the tank? Correct your answer to 1 decimal place.
Volume of 1 cube
= 9 x 9 x 9
= 729 cm³ 

Volume of 4 cubes
= 4 x 729
= 2916 cm³ 

1 ℓ = 1000 mℓ
7 ℓ = 7000 mℓ

Volume of water in the tank
= 11 x 7000
= 77000 mℓ

Volume of ¹₅ of the tank
= 77000 + 2916
= 79916 mℓ

Volume of the tank
= 79916 ÷ ¹₅
= 79916 x ⁵₁
= 399580 mℓ

Base area
= 75 x 29
= 2175 cm² 

Height of the tank
= 399580 ÷ 2175
≈ 183.7 cm

Answer(s): 183.7 cm