# QA – Placement Quizzes | Mensuration 3D | Question 12

A solid piece of iron of dimensions 49 * 33 * 24 cm³ is molded into a sphere. The radius of the sphere is:**(A)** 21 cm**(B)** 28 cm**(C)** 35 cm**(D)** None of these**Answer:** **(A)****Explanation:** Volume of a Sphere = 4/3 * π * r³ = 49 * 33 * 24

r³ = 49 * 33 * 24 * 7/22 * 3/4 = 7³ * 11 * 3 * 2³ * 3 * 1/22 * 3/4 = 7³ * 3³ = 21³ cm³

Therefore, r = 21 cm.

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