Civil Services UPSC EPFO (EO/AO) Mock Test 2023 Quantitative Aptitude Mensuration Solid Figures

A solid spherical ball of iron with radius 6 cm is melted and recast in to 3 solid spherical balls. The radii of the two of the balls are 3 cm and 4 cm respectively, then the diameter of the 3rd ball is

1
10 cm
2
9 cm
3
12 cm
4
9.5 cm
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