The figure shows a container ²₃ filled with water. The container is made up of two cuboids. The top cuboid has a square base of length 30 cm and height of 21 cm. The bottom cuboid has a square base of length 9 cm and height 10 cm. Find the height of the water level from the base of the container.
Volume of the top cuboid
= 30 x 30 x 21
= 18900 cm³ 

Volume of the bottom cuboid
= 9 x 9 x 10
= 810 cm³ 

Total volume
= 18900 + 810
= 19710 cm³ 

1 container = 19710 cm^3 
2₃ container = 19710 x ²₃ = 13140 cm³ 

Volume of water in the top cuboid
= 13140 - 810
= 12330 cm³ 

Base Area of the top cuboid
= 30 x 30
= 900 cm² 

Height of water in the top cuboid
= 12330 ÷ 900
= 13.7 cm

Height of water from base
= 13.7 + 10
= 23.7 cm

Answer(s): 23.7 cm