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 Question from jake, a student: a storage tank is in the form of a cube. when it is full of water, the volume of water is 15.625 m cube. if the present depth of water is 1.3m, find the volume of water already used from tank

Hi Jake,

If the side length of a cube is $s$ meters then its volume is $s^3$ cubic meters. You know the volume is 15.625 cubic meters so what is $s?$