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SSC Sample Paper SSC CHSL (10+2) Sample Test Paper-2

  • question_answer
    Three cubes of iron of edges 9 cm, 12 cm and 15 cm respectively are melted to form a large single cube. The edge of the new cube is:

    A)  10 cm             

    B)  18cm  

    C)  24 cm 

    D)         None of these

    Correct Answer: B

    Solution :

     Volume of the new cube             \[={{(9)}^{3}}+{{(12)}^{3}}+{{(15)}^{3}}\]             \[=729+1728+3375\]             \[=5832\,\,c{{m}^{3}}\] \[\therefore \]One side of the new cube             \[=\sqrt[3]{5832}=18\,\,cm\]


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