The figure is not drawn to scale. U and V are two containers. The base area of U is 34 cm² while the base area of V is 50 cm². Container U and V contained some water and the height of the water level in Container U was 40 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 30 cm. What was the height of the water level in Container V at first?
Change in the water level of Container U
= 40 - 30
= 10 cm

Volume of water poured in the Container V
= 34 x 10
= 340 cm³ 

Height increase in Container V
= 340 ÷ 50
= 6.8 cm

Original height of the water in Container V
= 30 - 6.8
= 23.2 cm

Answer(s): 23.2 cm