The figure is not drawn to scale. N and P are two containers. The base area of N is 18 cm² while the base area of P is 63 cm². Container N and P contained some water and the height of the water level in Container N was 46 cm as shown. Dan then poured some water from Container N into Container P. After that, the height of the water level in both tanks became 18 cm. What was the height of the water level in Container P at first?
Change in the water level of Container N
= 46 - 18
= 28 cm

Volume of water poured in the Container P
= 18 x 28
= 504 cm³ 

Height increase in Container P
= 504 ÷ 63
= 8 cm

Original height of the water in Container P
= 18 - 8
= 10 cm

Answer(s): 10 cm