The figure is not drawn to scale. R and S are two containers. The base area of R is 34 cm² while the base area of S is 54 cm². Container R and S contained some water and the height of the water level in Container R was 55 cm as shown. Dan then poured some water from Container R into Container S. After that, the height of the water level in both tanks became 28 cm. What was the height of the water level in Container S at first?
Change in the water level of Container R
= 55 - 28
= 27 cm

Volume of water poured in the Container S
= 34 x 27
= 918 cm³ 

Height increase in Container S
= 918 ÷ 54
= 17 cm

Original height of the water in Container S
= 28 - 17
= 11 cm

Answer(s): 11 cm