railway DFCCIL MTS 2025 Mock Test Series Quantitative Aptitude Mensuration Solid Figures

Air is pumped into a spherical balloon, its radius increases from 7 cm to 14 cm. Find the ratio of volume of the balloon's in both circumstances.

1
2 : 5
2
1 : 9
3
1 : 8
4
3 : 7
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