Solve the problem. A local television station sends out ques…

Solve the problem. A local television station sends out questionnaires to determine if viewers would rather see a documentary, an interview show, or reruns of a game show. There were 500 responses with the following results: 150 were interested in an interview show and a documentary, but not reruns.20 were interested in an interview show and reruns but not a documentary70 were interested in reruns but not an interview show.120 were interested in an interview show but not a documentary.50 were interested in a documentary and reruns.30 were interested in an interview show and reruns.40 were interested in none of the three.\ How many are interested in exactly one kind of show?