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Well, if you read math books....
"Bring the scale and let's weigh these math books."
Add all the books and divide by 4: 18 + 19 + 24 + 23 = 84; 84 divided by 4 = 21 books per stack
12! = 12x11x10x9x8x7x6x5x4x3x2x1 = do the math yourself. Explanation: The first books has 12 options, the second book has 11, the third book has 10, et cetera.
because they didn't have math books or binder or folders so the had to use these to use and they didn't have any money so the had to hunt to get horn-books