It depends on the size of the bookshelf, as well as the thickness of the books you want to put in it.
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7654321 = 7! = 5,040
20% 9/45 You divide these (9 goes inside the divide box :D) and you get 0.2 which is 20%
20
1 cm = 10 mm therefore the shelf is 450mm 450mm/9mm = 50 books
There are three possible answers. She may have 9 books if 8 are 4cm and 1 is 3cm: 8 * 4 + 1 * 3 = 35Or 10 books if 5 are 4cm and 5 are 3 cm: 5 * 4 + 5 * 3 = 35Or 11 books if 2 are 4cm and 9 are 3 cm: 2 * 4 + 9 * 3 = 35