A survey of 275 adults found that during the last year, 70 traveled by plane but not by train, 40 traveled by train but not by plane, 25 traveled by bus but not by plane or by train, 80 traveled by...

A survey of 275 adults found that during the last year, 70 traveled by plane but not by train, 40 traveled by train but not by plane, 25 traveled by bus but not by plane or by train, 80 traveled by bus and plane, 45 traveled by all three, and 205 traveled by plane or train. How many did not travel by any of these modes of transportation?

And the answer is NOT zero. Someone already gave me that answer and it was incorrect.