In the diagram not drawn to scale, Tank E and Tank F each has a button that, when pressed, will cause the water to flow out if the water level is higher than the hole. Tank E measures 140 cm by 42 cm by 142 cm. Tank F measures 53 cm by 28 cm by 60 cm. Tank G is 70 cm by 25 cm by 20 cm. Both holes are located at a height of 15 cm from the top of their respective containers. When Tank E is completely filled with water and both buttons are pressed, what will be the final water level in Tank G?
Volume of Tank E to pour into Tank F
= 140 x 42 x 15
= 88200 cm³

Volume of the Tank F that can be filled before overflow
= 53 x 28 x (60 - 15)
= 66780 cm³ 

Volume of water in Tank G
= 88200 - 66780
= 21420 cm³ 

Base area of Tank G
= 70 x 25
= 1750 cm² 

Final height of Tank G
= 21420 ÷ 1750
= 12.24 cm

Answer(s): 12.24 cm