Question

In a town, 34% of the citizens contributed to the Republicans, 49% contributed to the Democrats,...

In a town, 34% of the citizens contributed to the Republicans, 49% contributed to the Democrats, and 14% contributed to both. What percentage contributed to neither party?
%

A college survey claimed that 63% of students took English composition, 45% took calculus, 15% took both, and 12% took neither. Show that these figures cannot be correct.

The real percentage that took neither class is 15, not 12% as claimed by the survey.

The real percentage that took both classes is 12, not 15% as claimed by the survey.    

The real percentage that took neither class is 7, not 12% as claimed by the survey.

The real percentage that took both classes is 7, not 15% as claimed by the survey.

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