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有一本书,姐姐妹妹都想买。但姐姐缺5块钱,妹妹缺l块钱。两人把钱合起来买这本书,钱仍然不够。你知道这本书的价格是多少
Have a book, sister and sister want to buy. But my sister missing five dollars, my sister lack of l dollars. The two together to buy the money, the money is still not enough. You know what the price of this book is