Printing US letter - 2 pages per sheet on 11x17

I've got a Keynote prsentation that I'm printing to PDF and having profesionally printed. The printer asked that I provide the PDF file in 11x17 format with 2 pages per sheet. Each page is 8.5x11 landscape. I've tried every permutation of page setup and printer setting... to no avail... anyone have any ideas? The best I can do is 11x17 with 2 pages per sheet... but each page is formatted as though it were 11x17 and then shrunk 50% to fit 8.5x11.

#386541

i think you need to reformat the pages to be in portrait mode. two landscaped pages are 8.5x22. two potraited pages are 11x17. savvy? or, maybe you could get those two landscaped pages on a 17x11, instead of 11x17. go landscape mode on the big page, right?

#386660