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6th Class Mathematics Mensuration Question Bank Menstruation

  • question_answer
    Three cubes of a metal are of edges 3 cm, 4 cm and 5 cm. These are melted together and from the melted material, another cube is formed. The edge of this cube is

    A)  8 cm              

    B)    10 cm

    C)  9cm               

    D)    6cm

    Correct Answer: D

    Solution :

         Let edge of the new cube = x cm. Volume of the newly formed figure (cube) = sum of volume of smaller cubes. i.e., \[{{(x)}^{3}}\,={{(3)}^{3}}+{{(4)}^{3}}+{{(5)}^{3}}=27\,+64+125=216\] \[\Rightarrow \,\,x=6\,cm\]


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