A shop keeper bought a certain number of copies of the same book from a wholesale dealer. If he buys 4 more books, then the price of each book is reduced to 1 rupee. If he buys 5 books less then the price of each book will increase by 2 rupees. Find the number of books he buys initially and the cost of each book.
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If the shopkeeper had purchased 4 more books, then the number of books purchased by him would be (x + 4). Thus, the number of books purchased by the shopkeeper is 16.
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