Two spheres of same metal weigh 1 kg and 7 kg. The radius of the smaller
sphere is 3 cm. The two spheres are melted to form a single big sphere. Find
the diameter of the new sphere.
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Two spheres of metal weigh - 1 kg and 7 kg
Radius of smaller one - 3 cm
Radius of new sphere - 3*7
- 21
Diameter of new sphere - 2R
- 2*21
- 42
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