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Math problem in the first grade of primary school: buy three pens and four books to share 68 yuan, and buy 1 pen 1 book to share 20 yuan. 1 How much is the book?
Use 20 yuan to buy 1 pens and 1 books, and then use 60 yuan to buy 3 pens and 3 books. However, to buy three pens and four books with 68 yuan * * * I bought one more book than the previous three pens and three books, so the extra money is one book. That is 68-60=8 yuan.
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