a study by the national park service revealed that 50 percent of vacationers going to the rocky mountain region visit yellowstone park, 40 percent vitit the tetons, and 3 percent visit both. answer
but that would be a bit weird, because then some people would fall into 3 categories, and usually its easier to keep things specific, so u can only be in one category
I think it was meant to say "... visit both. Answer the phone will you? Oh, don't bother, I'll get it. I'll finish typing this post later - just don't press Enter while I'm gone"