The figure is not drawn to scale. U and V are two containers. The base area of U is 24 cm² while the base area of V is 48 cm². Container U and V contained some water and the height of the water level in Container U was 41 cm as shown. Dan then poured some water from Container U into Container V. After that, the height of the water level in both tanks became 21 cm. What was the height of the water level in Container V at first?
Change in the water level of Container U
= 41 - 21
= 20 cm

Volume of water poured in the Container V
= 24 x 20
= 480 cm³ 

Height increase in Container V
= 480 ÷ 48
= 10 cm

Original height of the water in Container V
= 21 - 10
= 11 cm

Answer(s): 11 cm