Citizenship Survey

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In the results of a survey administered to the students in a particular class, identified themselves as citizens of the U.S. only, identified themselves as not U.S. citizens, identified themselves as citizens of both the U.S. and at least one other country, and 28 students did not reply to the survey. What is the number of students in the class?

Review: Citizenship Survey


Explanation

If the number of people in the class are N, then



Ballparking, we can see that of the class is everyone except about 23%, which is 28 people. Since 23 and 28 are close, one person is roughly one percent, and the total number will be close to 100, probably (B) or (C). And it can't be (B), because 110 is not divisible by 3 and so it would give non-integer numbers of people.

The correct answer is (C).


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