Thirty-five ties were researched to determine whether they had a professional sports team, a symphony, or a childrens museum of these stes, 15 rada professional sports team, 21 had a symphony, 16 had a childrens museum, 11 had a professional sports team and a symphony, had a godersioni sportistem and
a children's museum, 11 had a symphony and a childreds museum, and 5 had all these cities. Complete carts a) trossbow
a) How many of the cities surveyed had only a professional sports team
(Simplify your answer