The figure is not drawn to scale. W and X are two containers. The base area of W is 12 cm² while the base area of X is 20 cm². Container W and X contained some water and the height of the water level in Container W was 45 cm as shown. Dan then poured some water from Container W into Container X. After that, the height of the water level in both tanks became 22 cm. What was the height of the water level in Container X at first?
Change in the water level of Container W
= 45 - 22
= 23 cm

Volume of water poured in the Container X
= 12 x 23
= 276 cm³ 

Height increase in Container X
= 276 ÷ 20
= 13.8 cm

Original height of the water in Container X
= 22 - 13.8
= 8.2 cm

Answer(s): 8.2 cm