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Mathematics 21 Online
OpenStudy (anonymous):

Question Part Points Submissions Used In a certain year, 87% of all Caucasians in the U.S., 77% of all African-Americans, 77% of all Hispanics, and 77% of residents not classified into one of these groups used the Internet for e-mail. At that time, the U.S. population was 65% Caucasian, 12% African-American, and 10% Hispanic. What percentage of U.S. residents who used the Internet for e-mail were Hispanic? (Round your answer to the nearest whole percent.)

OpenStudy (anonymous):

an easy way to solve such problems would be to take a basis. so you can assume there were a total population of 100 and work on from there. it doesn't affect the final answer

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