A sphere of radius 5 cm is melted and recast into spheres of 2 cm each. How many such spheres can be made? (approx.)
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 16
The volume of the sphere with radius 5 cm = (4ᴨ/3) × 53
The volume of the sphere with radius 2 cm = (4ᴨ/3) × 23
Number of small spheres = [(4ᴨ/3) × 53]/(4ᴨ/3) × 23 = 15.625
So, no. of small spheres = 16