Book Wrecker

You are holding a book, which has 500 non-blank pages individually labelled.

If you tear off all the pages starting from the one labelled 'page 311' until the one labelled 'page 458', this book will have 350 non-blank pages left.

Now, if you tear off all the pages from the one labelled 'page 216' until the one labelled 'page 242', how many non-blank pages will be left?

Note: One sheet of paper has 2 pages, one page on one side and one page on the other. The first labelled non-blank page is on top of all the other non-blank pages. All non-blank pages are labelled sequentially with no blanks in between.

This is one part of 1+1 is not = to 3.

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