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No 2 and No 4 questions

No 2 and No 4 questions-example-1

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No 2
6 books on one shelf
50 books at least 100 at most
50/6 = 8.3 round up because shelves are an abject
The least amount of books would need 9 shelves.
100/6 = 17.67
Round up again so 18 shelves
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