If this book begins as 100% and he is asked to cut 13%, we need to subtract 100% - 13%. This is the amount that remains.

`100% - 13% = 87%` .

`87%` of the original number of pages are in the final version.

** If the book began with "x" pages,...**

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If this book begins as 100% and he is asked to cut 13%, we need to subtract 100% - 13%. This is the amount that remains.

`100% - 13% = 87%` .

`87%` of the original number of pages are in the final version.

**If the book began with "x" pages, then the book after the cut would have 87% of x pages remaining, or `.87x` **