Book Maths Puzzle

Which would you say is heavier,a pound of cotton or a pound of gold.

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Book Other Question

4sin@+4sin^2@+4sin^3@+....a geometric series? find the sum to infinity of the series. A man buys certain number of books for Rs.720.If a cost per book was Rs.5 less,the number of books that could be bought would be 2 more.What is the cost per book?