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    Question

    Three cubes with sides 3 cm, 4 cm, and 5 cm are melted to form a bigger cube. What is the surface area of the bigger cube?

     

    A 216 Correct Answer Incorrect Answer
    B 125 Correct Answer Incorrect Answer
    C 343 Correct Answer Incorrect Answer
    D 729 Correct Answer Incorrect Answer

    Solution

    Let side of bigger cube be a cm. So, a 3 = (3)3 + 43   + (5)3   a3 = 27 + 64 + 125 a3 = 216 a =6 the surface area of the bigger cube = 6 x 62   = 6 x 36 = 216 cm 2  

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