The figure is not drawn to scale. J and K are two containers. The base area of J is 21 cm² while the base area of K is 70 cm². Container J and K contained some water and the height of the water level in Container J was 58 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 26 cm. What was the height of the water level in Container K at first?
Change in the water level of Container J
= 58 - 26
= 32 cm

Volume of water poured in the Container K
= 21 x 32
= 672 cm³ 

Height increase in Container K
= 672 ÷ 70
= 9.6 cm

Original height of the water in Container K
= 26 - 9.6
= 16.4 cm

Answer(s): 16.4 cm