New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    type-ssc

    Three cubes of metal whose edges are 3cm, 4cm and 5cm.

    respectively are melted and a single cube is formed. What is the length of the edge of the newly formed cube?
    A 6cm Correct Answer Incorrect Answer
    B 12cm Correct Answer Incorrect Answer
    C 10cm Correct Answer Incorrect Answer
    D 9cm Correct Answer Incorrect Answer

    Solution

    Volume of recast cubes = 33+43+53=27+64+125 = 216 Note- When many cubes are integrated into one cube the side of the new cube will be – a3 = Sum of cubes of sides of all the cube a3 = 216 a=6cm

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