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How do I get summary of pagination like '11-20 of 200 results'?

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I'm using pagination but I want to place a summary text somewhere in the template.

Basically my query has a limit=20 so somewhere on the page I want to say something like "Showing 21 through 40 of 290 results".

I can get the total results by doing my query again with $pages->count() unless this is not performant? But how do I know that I'm viewing 21-40 results? And on the last page where it might not be returning a full 20 pages, it would probably say something like "Showing 281-290".

I thought I could just do some math using the $input->pageNum and then calculating based on my limit=20. This just seems messy somehow. I'm looking for a better way unless there is no better way.

Thanks

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Thanks, that makes sense, but templates are edited in the file system. 

Do we have access to the file system templates of the skyscraper demo? Or is there a way to view the template files from the demo admin?

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