



 
HI Nat, I think you mean 1200 cubic centimeters $(cm^3),$ not square centimeters. The volume of the water in the tank is the area of the base times the height, ie $A \times h$ where $A$ is the area of the base in square centimeters and $h$ is the height in centimeters. You know the area of the base is 80 square centimeters so solve $A \times h = 1200$ for $h.$ This is the height of the water which is $/large \frac{5}{9}$ of the height of the tank. What is $\large \frac{1}{9}$ of the height of the tank? Penny 



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