The figure is not drawn to scale. M and N are two containers. The base area of M is 27 cm² while the base area of N is 30 cm². Container M and N contained some water and the height of the water level in Container M was 43 cm as shown. Dan then poured some water from Container M into Container N. After that, the height of the water level in both tanks became 26 cm. What was the height of the water level in Container N at first?
Change in the water level of Container M
= 43 - 26
= 17 cm

Volume of water poured in the Container N
= 27 x 17
= 459 cm³ 

Height increase in Container N
= 459 ÷ 30
= 15.3 cm

Original height of the water in Container N
= 26 - 15.3
= 10.7 cm

Answer(s): 10.7 cm