The figure is not drawn to scale. X and Y are two containers. The base area of X is 22 cm² while the base area of Y is 55 cm². Container X and Y contained some water and the height of the water level in Container X was 54 cm as shown. Dan then poured some water from Container X into Container Y. After that, the height of the water level in both tanks became 29 cm. What was the height of the water level in Container Y at first?
Change in the water level of Container X
= 54 - 29
= 25 cm

Volume of water poured in the Container Y
= 22 x 25
= 550 cm³ 

Height increase in Container Y
= 550 ÷ 55
= 10 cm

Original height of the water in Container Y
= 29 - 10
= 19 cm

Answer(s): 19 cm