A local television station sent out questionnaires to determine if viewers would rather see a

Question

documentary, an interview show, or reruns of a game show. There were 700 responses with the
following results:
210 were interested in an interview show and a documentary, but not reruns.
28 were interested in an interview show and reruns but not a documentary.
98 were interested in reruns but not an interview show.
168 were interested in an interview show but not a documentary.
70 were interested in a documentary and reruns.
42 were interested in an interview show and reruns.
56 were interested in none of the three.
How many are interested in exactly one kind of show? its hard help..