Figure B shows a closed rectangular tank of dimensions 44 cm by 44 cm by 80 cm with a cube of edge 23 cm glued to its bottom right corner. The tank contains 80 litres of water. Figure C 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 C 
= 44 - 23
= 21 cm

Volume of water under the cube in Figure C 
= 80 x 44 x 21
= 73920 cm³ 

1 ℓ = 1000 
80 ℓ = 80000cm³ 

Volume of water beside the cube
= 80000 - 73920
= 6080 cm³ 

Base area of water beside the cube
= (44 x 80) - (23 x 23)
= 3520 - 529
= 2991 cm² 

Height of water level beside the cube
= 6080 ÷ 2991
≈ 2.03 cm

Height of the water level
= 2.03 + 23
≈ 25.03 cm

Answer(s): 25.03 cm