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Question

The volume of a closed cubical tank is 1331 cubic metre. Find the length of the side of the cubical tank 


  1. 12 m

  2. 13 m 

  3. 11 m 

  4. 20 m 


Solution

The correct option is C

11 m 


Let the side of the given cubical tank be 'a' metres .

Volume of the given cube is a×a×a

 Length of the side of cubical tank = 3volume

Given that volume = 1331 cubic metre 

 Length of the side of cubical tank = 31331

Prime factorizing 1331 we get
1331=113
Cube root of 1331 is 11

Hence, the length of the side of the cube = 11 m 

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