The figure is not drawn to scale. J and K are two containers. The base area of J is 46 cm² while the base area of K is 69 cm². Container J and K contained some water and the height of the water level in Container J was 46 cm as shown. Dan then poured some water from Container J into Container K. After that, the height of the water level in both tanks became 28 cm. What was the height of the water level in Container K at first?
Change in the water level of Container J
= 46 - 28
= 18 cm

Volume of water poured in the Container K
= 46 x 18
= 828 cm³ 

Height increase in Container K
= 828 ÷ 69
= 12 cm

Original height of the water in Container K
= 28 - 12
= 16 cm

Answer(s): 16 cm