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Question:

How many spherical balls of radius 5 cm can be made by melting a spherical clay ball having a radius of 15 cm?

Explanation:

Let 'n' spherical balls can be made.

∴ Volume of n spherical balls = Volume of the original clay ball

⇒ 4/3 × π × 5³ × n = 4/3 × π × 15³

⇒ 5³ × n = 15³

⇒ n = 3³

⇒ n = 27

Hence, option (b).