The figure is not drawn to scale. E and F are two containers. The base area of E is 12 cm² while the base area of F is 60 cm². Container E and F contained some water and the height of the water level in Container E was 61 cm as shown. Dan then poured some water from Container E into Container F. After that, the height of the water level in both tanks became 23 cm. What was the height of the water level in Container F at first?
Change in the water level of Container E
= 61 - 23
= 38 cm

Volume of water poured in the Container F
= 12 x 38
= 456 cm³ 

Height increase in Container F
= 456 ÷ 60
= 7.6 cm

Original height of the water in Container F
= 23 - 7.6
= 15.4 cm

Answer(s): 15.4 cm