The figure shows a container ⁴₅ filled with water. The container is made up of two cuboids. The top cuboid has a square base of length 27 cm and height of 28 cm. The bottom cuboid has a square base of length 9 cm and height 18 cm. Find the height of the water level from the base of the container.
Volume of the top cuboid
= 27 x 27 x 28
= 20412 cm³ 

Volume of the bottom cuboid
= 9 x 9 x 18
= 1458 cm³ 

Total volume
= 20412 + 1458
= 21870 cm³ 

1 container = 21870 cm^3 
4₅ container = 21870 x ⁴₅ = 17496 cm³ 

Volume of water in the top cuboid
= 17496 - 1458
= 16038 cm³ 

Base Area of the top cuboid
= 27 x 27
= 729 cm² 

Height of water in the top cuboid
= 16038 ÷ 729
= 22 cm

Height of water from base
= 22 + 18
= 40 cm

Answer(s): 40 cm