Exams › SSC CGL (Prelims) › General

A sphere has volume $V$. If its radius is made three times the original, by what percentage does the volume grow?

1. 800%
2. 2700%
3. 2600%
4. 900%

Correct answer: 2600%

Solution

Since volume is proportional to r^3, tripling the radius multiplies volume by 27. The increase is therefore 27V - V = 26V, which is 2600% of the original volume.

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