The figure is not drawn to scale. G and H are two containers. The base area of G is 14 cm² while the base area of H is 20 cm². Container G and H contained some water and the height of the water level in Container G was 41 cm as shown. Dan then poured some water from Container G into Container H. After that, the height of the water level in both tanks became 20 cm. What was the height of the water level in Container H at first?
Change in the water level of Container G
= 41 - 20
= 21 cm

Volume of water poured in the Container H
= 14 x 21
= 294 cm³ 

Height increase in Container H
= 294 ÷ 20
= 14.7 cm

Original height of the water in Container H
= 20 - 14.7
= 5.3 cm

Answer(s): 5.3 cm