If the radius of the new spherical container is double the radius of the old spherical container the...........

Quantitative Aptitude Mensuration 3D

If the radius of the new spherical container is double the radius of the old spherical container, then the ratio of the volume of the new container and the volume of the old container is

This questions was previously asked in

EPFO AO EO 2017

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Explanation:

Let the original radius be r
so the original volume = 4/3πr³
new radius = 2r
so new volume = 4/3π (2r)³ = 4/3 π (8r³)
ratio = 4/3π (8r³) /4/3π (r³)
= 8r³ / r³ = 8/1
so the ratio is 8:1