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We'll use your example of ton and the book. let the TOTAL amount of pages = x 85/x = 20/100 (percentage) therefore, you must divide 85 by the percentage, 0.2 or 20/100 x = 85/0.2 x= 425 in general, use the formula x = a/p where a is the number given to you (eg 85) and p is the percentage as a fraction (20% = 20/100 = 0.2)

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