Question

A bookstore manager earns a profit of rupees 20 by selling one new book and incurs a loss of rupees 10 by selling a second hand old book. In a particular month he earns neither profit nor loss. If he sold 25 new book, how many second hand old books did he sell?
Please tell the correct answer please I beg you I only want the answer nothing else please no greeting only the maths answer step by step

Answer 1

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Answer 2

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