Question: Students living in a certain dormitory were asked about their enrollment in mathematics and history courses. Ten percent were taking both types of courses, and

Students living in a certain dormitory were asked about their enrollment in mathematics and history courses. Ten percent were taking both types of courses, and twenty percent were taking neither type of course. One hundred sixty students were taking a mathematics course but not a history course, and one hundred twenty students were taking a history course but not a mathematics course. How many students were taking a mathematics course?

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