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      Question

      A rod of length of 616 cm and 35cm radius is melted and

      converted into a sphere of radius 21cm, find how many such proper spheres can be made?
      A 55 Correct Answer Incorrect Answer
      B 68 Correct Answer Incorrect Answer
      C 61 Correct Answer Incorrect Answer
      D 51 Correct Answer Incorrect Answer

      Solution

      Volume of rod = Ο€rΒ²h
      Volume of sphere = Ο€rΒ³
      Ο€ Γ— 35 Γ— 35 Γ— 616 = n Γ— 4/3 Γ— Ο€ Γ— 21 Γ— 21 Γ— 21
      n = 61.11
      No. of spheres = 61

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