windows 7

When you choose File > Print..., there's a button labeled Subset: All pages in range. You can click on that button and Odd Pages Only or Even Pages Only. Do one of those and print the document. Flip the pages over and put them back into the input tray and print the document again after choosing the other. Practice on a short document first to make sure you know which way the pages need to be collated after the first print.

How many pages you're able to print depends on whether you have the extra large or regular black cartridge, whether you print in color or set the output to black only, what print quality you choose (draft, etc.) and how much you've used the cartridge(s) before. The density of text and the amount of graphics will have a lot to do with it as well. HP rates the regular black cartridge for that printer at 200 pages and the extra large black cartridge at 700 pages.