Question
A rectangular tank is filled with water to a height of 9 cm. Its rectangular base measures 40 cm by 12 cm. When 14.4 litres of water are poured into the tank, the water level rises to 35 of the height of the tank. Find the height of the tank.
3 m

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A rectangular tank is filled with water to a height of 9 cm. Its rectangular base measures 40 cm by 12 cm. When 14.4 litres of water are poured into the tank, the water level rises to 35 of the height of the tank. Find the height of the tank.