With my bean recipe, 1 of those cans plus the "goodies" fills a 1/2 size aluminum steam table pan right to the top. Seven cans may fit into 3 full sized pans since the full size holds a little more than double the 1/2 size pans. Certainly no more than four full sized pans would do the trick. Best of luck!
I've cooked a lot of beans and if you add much of anything to the Bush's then 1 can = 1 1/2 pan. I use 5 half pans for 2 cans, plus 1 of other beans and one of pie filling plus pulled pork, onions and bbq sauce.
In my world, 70 servings of beans fit in 1 full size steam pan. 1 can (#10) of Bush's, 1/2 can of great northerns, 1/2 can black beans, 1/2 can red beans, 1/2 can apple pie filling, sauce, brisket / pork, dried minced onions, mollasses, rub.