SOLUTION: Hi A rectangular tank of height 120cm is half filled with water. When 62.6 litres of water is added to the tank it becomes 2/3 full. What is the base area of the tank. What wi

High water level is   = 80 cm.


Low  water level is   = 60 cm.


The change of the water volume is  V = A*(80-60) = 20A cm^3,  where A is the base area, in cm^2.


The volume equation is


    20A = 62600 cm^3


From the equation, the base area  A =  = 3130 cm^2.     ANSWER


To find the new height of the water if extra 1565 cm^3 of water added, add    to 80 cm.  You will get then

    the new level = 80 +  = 80 + 0.5 = 80.5 cm.     ANSWER