Multiple Choice Questions on Three copper spheres of radii 3 cm 4 cm and 5 cm are melted to form a large sphere What is its radiu........... for CDS Exam Preparation

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Multiple Choice Questions

Three copper spheres of radii 3 cm 4 cm and 5 cm are melted to form a large sphere What is its radiu...........

Quantitative Aptitude (CDS) Mensuration 3D
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    Three copper spheres of radii 3 cm , 4 cm and 5 cm are melted to form a large sphere . What is its radius?

    12 cm

    Incorrect Answer

    10 cm

    Incorrect Answer

    8 cm

    Incorrect Answer

    6 cm

    Correct Answer
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    Explanation:

    Let R be radius of large sphere
    According to question 4/3 \pi( 33 +43+53) = 4/3\piR3  
    27+64+125=R3
    216=R3  => R=6 cm

    By: Munesh Kumari
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