Container E and F are identical containers with the same base area and height. Container E is filled to the brim with water while Container F is empty. After 224 cm³ of water from Container E is poured into Container F, the depth of water in Container F is ¹₈ the depth of water in Container E. If the height of Container F is 21 cm, what is the base area of Container F?
The depth of water is proportional to the volume of water.

After water from Container E is poured into Container F:

Volume of water in Container E : Volume of water in Container F
 8 : 1

1 u = 224

Total volume of Container F
= 8 u + 1 u
= 9 u
= 9 x 224
= 2016 cm³

Base area of Container F
= 2016 ÷ 21
= 96 cm²

Answer(s): 96 cm²