The figure shows a tank ²₅ filled with water. The tank is made up of two cuboids. The top cuboid has a square base of length 22 cm and height of 28 cm. The bottom cuboid has a square base of length 11 cm and height 8 cm. Find the height of the water level from the base of the tank.
Volume of the top cuboid
= 22 x 22 x 28
= 13552 cm³ 

Volume of the bottom cuboid
= 11 x 11 x 8
= 968 cm³ 

Total volume
= 13552 + 968
= 14520 cm³ 

1 tank = 14520 cm^3 
2₅ tank = 14520 x ²₅ = 5808 cm³ 

Volume of water in the top cuboid
= 5808 - 968
= 4840 cm³ 

Base Area of the top cuboid
= 22 x 22
= 484 cm² 

Height of water in the top cuboid
= 4840 ÷ 484
= 10 cm

Height of water from base
= 10 + 8
= 18 cm

Answer(s): 18 cm