The figure is not drawn to scale. D and E are two containers. The base area of D is 12 cm² while the base area of E is 52 cm². Container D and E contained some water and the height of the water level in Container D was 44 cm as shown. Dan then poured some water from Container D into Container E. After that, the height of the water level in both tanks became 18 cm. What was the height of the water level in Container E at first?
Change in the water level of Container D
= 44 - 18
= 26 cm

Volume of water poured in the Container E
= 12 x 26
= 312 cm³ 

Height increase in Container E
= 312 ÷ 52
= 6 cm

Original height of the water in Container E
= 18 - 6
= 12 cm

Answer(s): 12 cm