Container J and K are identical containers with the same base area and height. Container J is filled to the brim with water while Container K is empty. After 267 cm³ of water from Container J is poured into Container K, the depth of water in Container K is ¹₆ the depth of water in Container J. If the height of Container K is 21 cm, what is the base area of Container K?
The depth of water is proportional to the volume of water.

After water from Container J is poured into Container K:

Volume of water in Container J : Volume of water in Container K
 6 : 1

1 u = 267

Total volume of Container K
= 6 u + 1 u
= 7 u
= 7 x 267
= 1869 cm³

Base area of Container K
= 1869 ÷ 21
= 89 cm²

Answer(s): 89 cm²