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2016-01-25T08:56:22+05:30

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Volume of cubical tank = 15.625 m³
side³ =15.625
⇒side = 2.5 m
present depth = 1.3 m
so empty depth = 2.5 - 1.3 = 1.2 m
volume of water used = 2.5×2.5×1.2 = 7.5 m³ 
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2016-01-25T20:34:45+05:30
The volume of tank=15.625 m^3
So side of tank=(15.625)^1/3 m=2.5m
Now 
Depth of water =1.3m therefore
Depth of water used=2.5-1.3m=1.2m
So volume of water used=2.5×2.5×1.2m^3
=7.5 m^3
=7.5×1000 liter
=7500 litre
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