In the diagram not drawn to scale, Container P and Container Q each has a button that, when pressed, will cause the water to flow out if the water level is higher than the hole. Container P measures 70 cm by 85 cm by 90 cm. Container Q measures 15 cm by 10 cm by 50 cm. Container R is 70 cm by 20 cm by 50 cm. Both holes are located at a height of 5 cm from the top of their respective containers. When Container P is completely filled with water and both buttons are pressed, what will be the final water level in Container R? Express your answer in mixed number.
Volume of Container P to pour into Container Q
= 70 x 85 x 5
= 29750 cm³

Volume of the Container Q that can be filled before overflow
= 15 x 10 x (50 - 5)
= 6750 cm³ 

Volume of water in the Container R
= 29750 - 6750
= 23000 cm³ 

Base Area of the Container R
= 70 x 20
= 1400 cm² 

Final height of the container R
= 16⁶⁰⁰₁₄₀₀
= 16³₇ cm

Answer(s): 16³₇ cm