In the diagram not drawn to scale, Container C and Container D each has a button that, when pressed, will cause the water to flow out if the water level is higher than the hole. Container C measures 100 cm by 75 cm by 80 cm. Container D measures 75 cm by 60 cm by 50 cm. Container E is 60 cm by 30 cm by 30 cm. Both holes are located at a height of 20 cm from the top of their respective containers. When Container C is completely filled with water and both buttons are pressed, what will be the final water level in Container E? Express your answer in mixed number.
Volume of Container C to pour into Container D
= 100 x 75 x 20
= 150000 cm³

Volume of the Container D that can be filled before overflow
= 75 x 60 x (50 - 20)
= 135000 cm³ 

Volume of water in the Container E
= 150000 - 135000
= 15000 cm³ 

Base Area of the Container E
= 60 x 30
= 1800 cm² 

Final height of the container E
= 8⁶⁰⁰₁₈₀₀
= 8¹₃ cm

Answer(s): 8¹₃ cm