To determine how many nights Niall will need to finish the book, we can follow these steps:
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Calculate how many pages he has left to read: Total pages in the book = 520 pages
Pages already read = 100 pages
Pages left to read = 520 - 100 = 420 pages -
Determine how many pages he reads per night: Pages per night = 60 pages
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Calculate how many nights it will take to finish reading: Nights needed = Pages left to read / Pages per night
Nights needed = 420 / 60 = 7 nights
Therefore, it will take Niall 7 nights to finish the book.