The political science department at a university surveyed a number of politicians regarding their perception of college students and gathered the following information: 15 saw students as hardworking and economically advantaged. 25 saw students as hardworking. (hint:some of the 25 are economically advantaged and some are not.) 11 believed students were economically advantaged but not hardworking. 16 believed students were neither hardworking nor economically advantaged. How many politicians were surveyed?

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