The figure is not drawn to scale. V and W are two containers. The base area of V is 15 cm² while the base area of W is 39 cm². Container V and W contained some water and the height of the water level in Container V was 65 cm as shown. Dan then poured some water from Container V into Container W. After that, the height of the water level in both tanks became 26 cm. What was the height of the water level in Container W at first?
Change in the water level of Container V
= 65 - 26
= 39 cm

Volume of water poured in the Container W
= 15 x 39
= 585 cm³ 

Height increase in Container W
= 585 ÷ 39
= 15 cm

Original height of the water in Container W
= 26 - 15
= 11 cm

Answer(s): 11 cm