Question 991417: A survey of 270 adults found that during the last year, 60 traveled by plane but not by train, 80 traveled by train but not by plane, 40 traveled by bus but not by plane or by train, 65 traveled by bus and plane, 30 traveled by all three, and 195 traveled by plane or train. How many did not travel by any of these modes of transportation?
Answer by solver91311(24713)   (Show Source):
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195 travelled by plane or train, which does not exclude anyone who may have also travelled by bus which means that 195 represents the group of people who used any of the modes of transport except those who only travelled by bus. Then 40 travelled only by bus. Hence 195 plus 40 is the number of people who travelled by any of the three modes of transport. That sum, subtracted from the overall population of the survey is the number who did not use any of the three modes of transportation.
John
My calculator said it, I believe it, that settles it
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