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Martha has read 52 pages of her book. This is 20% of the book. How many pages does the book have?  

 Apr 1, 2021
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let x be the number of pages in the book:

\(\frac{20}{100}x=52\\\frac{1}{5}x=52\\x=5\cdot52=\boxed{260}\)

 Apr 1, 2021

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