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A book seller has 420 science books and 130 arts stream books.

 He wants to stack them in such a way that each stack has the same number and they take up the least area of the surface:
(i)What is the maximum number of science books that can be placed in each stack for this purpose?
(ii)What is the mathematical concept used to solve the above problem?
(iii)If the book seller make a stack, then which kinds of quality are shown by the book seller?

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