The figure is not drawn to scale. L and M are two containers. The base area of L is 12 cm² while the base area of M is 52 cm². Container L and M contained some water and the height of the water level in Container L was 52 cm as shown. Dan then poured some water from Container L into Container M. After that, the height of the water level in both tanks became 26 cm. What was the height of the water level in Container M at first?
Change in the water level of Container L
= 52 - 26
= 26 cm

Volume of water poured in the Container M
= 12 x 26
= 312 cm³ 

Height increase in Container M
= 312 ÷ 52
= 6 cm

Original height of the water in Container M
= 26 - 6
= 20 cm

Answer(s): 20 cm