Syntel Company Numerical Ability Area and Volume

How many complete spheres of radius r/10 can you make by melting and re-moulding a sphere of raduis r?

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Syntel Other Question

Kumar, a book store owner sells 10 pens at a profit of 12% .If he had sold it at a loss of 12% then he would have
got Rs.60/- less. At what price did Kumar buy the pens for?
In a village there are 2000 people. In 2005 the population increased 10%, 12% in 2006, 14% in 2007. What is the
population at the begining of 2008?