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A storage tank is in the form of cube when it is full of water the volume of the water is 15.6265 meter cube. if the present depth of the water is 1.3m

then find the volume of water already used from tank.


Let height of tank=h
Then we have volume of tank h³=15.6265m³
                                         ⇒ h=2.5m
water already used is (2.5-1.3)=1.2m height
Volume of water used =(2.5)²*1.2
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