The figure is not drawn to scale. A and B are two containers. The base area of A is 33 cm² while the base area of B is 60 cm². Container A and B contained some water and the height of the water level in Container A was 49 cm as shown. Dan then poured some water from Container A into Container B. After that, the height of the water level in both tanks became 28 cm. What was the height of the water level in Container B at first?
Change in the water level of Container A
= 49 - 28
= 21 cm

Volume of water poured in the Container B
= 33 x 21
= 693 cm³ 

Height increase in Container B
= 693 ÷ 60
= 11.55 cm

Original height of the water in Container B
= 28 - 11.55
= 16.45 cm

Answer(s): 16.45 cm