There are only three kinds of books on a bookshelf, science book, novel book, and workbooks, in the ratio of 2 to 5 to 7. What is the total number of the books on the shelf?
(1) There are less than 5 science books on the shelf.
(2) The total number of novel book and workbook is24.
...
(1) There are less than 5 science books on the shelf.
(2) The total number of novel book and workbook is24.
...
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