Question
Figure D shows a closed rectangular tank of dimensions 40 cm by 40 cm by 90 cm with a cube of edge 18 cm glued to its bottom right corner. The tank contains 90 litres of water. Figure E shows the same rectangular tank lying on its side. Find the height of the water level, in centimetres, corrected to 2 decimal places.
3 m

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Figure D shows a closed rectangular tank of dimensions 40 cm by 40 cm by 90 cm with a cube of edge 18 cm glued to its bottom right corner. The tank contains 90 litres of water. Figure E shows the same rectangular tank lying on its side. Find the height of the water level, in centimetres, corrected to 2 decimal places.