SOLUTION: A tank measures 40cm by 30cm by 20cm. It was half filled with water, when a rock was put in to the tank, the water level rose by 20%. how much more water would be required to fill

Question 1160418: A tank measures 40cm by 30cm by 20cm. It was half filled with water, when a rock was put in to the tank, the water level rose by 20%. how much more water would be required to fill the tank to the brim??
Answer by ikleyn(52847) (Show Source): You can put this solution on YOUR website!
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The tank volume is  40*30*20 = 24000  cm^3.


The water volume in the tank originally is 50% of this volume.


After submerging the rock into the water, the occupied volume in the tank is 70% of the tank volume.


Hence, to fill the tank, the needed additional water volume is 30% of the tank volume,  i.e.


    0.3*24000 = 7200 cm^3.     ANSWER

Solved.

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From my post, learn how to get the answer without making unnecessary calculations.

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