SOLUTION: 500 people were surveyed at a blood drive; 215 gave blood, 153 set-up and 89 did both, how many people did neither? How would I set this up?

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Question 408681: 500 people were surveyed at a blood drive; 215 gave blood, 153 set-up and 89 did both, how many people did neither?
How would I set this up?
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
500 - (215 + 153 - 89) = 221.