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2015-12-08T22:25:01+05:30

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Two spheres are of same metal therefore the density of both would be same.
density=mass/volume by using this expression u can calculate the volume the other sphere.(it will come out to be 7 times the smaller one)
Now you know the volume of both the spheres u can calculate the total volume and the volume will remain constant in the process of melting i.e.
V(net initial volume) = V(final volume)
and bam you will get the answer
the final radius will be 6 cm and thus the diameter will be 12 cm
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