SOLUTION: In a survey of 250 students, 90 were taking mathematics and 70 were taking psychology. What is the greatest number of students who could have been taking both courses?

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Question 505794: In a survey of 250 students, 90 were taking mathematics and 70 were taking psychology. What is the greatest number of students who could have been taking both courses?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
70 is the greatest number.
If 71 were taking both, that exceeds the
number taking psychology