The figure is not drawn to scale. H and J are two containers. The base area of H is 38 cm² while the base area of J is 57 cm². Container H and J contained some water and the height of the water level in Container H was 43 cm as shown. Dan then poured some water from Container H into Container J. After that, the height of the water level in both tanks became 25 cm. What was the height of the water level in Container J at first?
Change in the water level of Container H
= 43 - 25
= 18 cm

Volume of water poured in the Container J
= 38 x 18
= 684 cm³ 

Height increase in Container J
= 684 ÷ 57
= 12 cm

Original height of the water in Container J
= 25 - 12
= 13 cm

Answer(s): 13 cm