The figure is not drawn to scale. R and S are two containers. The base area of R is 28 cm² while the base area of S is 50 cm². Container R and S contained some water and the height of the water level in Container R was 59 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 29 cm. What was the height of the water level in Container S at first?
Change in the water level of Container R
= 59 - 29
= 30 cm

Volume of water poured in the Container S
= 28 x 30
= 840 cm³ 

Height increase in Container S
= 840 ÷ 50
= 16.8 cm

Original height of the water in Container S
= 29 - 16.8
= 12.2 cm

Answer(s): 12.2 cm