Figure Z shows a closed rectangular tank of dimensions 44 cm by 44 cm by 75 cm with a cube of edge 26 cm glued to its bottom right corner. The tank contains 70 litres of water. Figure A shows the same rectangular tank lying on its side. Find the height of the water level, in centimetres, corrected to 2 decimal places.
Height of water under the cube in Figure A 
= 44 - 26
= 18 cm

Volume of water under the cube in Figure A 
= 75 x 44 x 18
= 59400 cm³ 

1 ℓ = 1000 
70 ℓ = 70000cm³ 

Volume of water beside the cube
= 70000 - 59400
= 10600 cm³ 

Base area of water beside the cube
= (44 x 75) - (26 x 26)
= 3300 - 676
= 2624 cm² 

Height of water level beside the cube
= 10600 ÷ 2624
≈ 4.04 cm

Height of the water level
= 4.04 + 26
≈ 30.04 cm

Answer(s): 30.04 cm