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9 October, 17:35

Records show that 5% of all college students are foreign students who also smoke. it is also known that 50% of all foreign college students smoke. what percent of the students at this university are foreign?

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  1. 9 October, 21:27
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    10% Simplest way to solve this problem is realizing that if 50% of all foreign students smoke, then that also means that 50% of all foreign students don't smoke (100% - 50% = 50%). So for every smoking foreign student you see, there's a non-smoking foreign student. So just double the number of smoking foreign students to get the total number foreign students. So 5% * 2 = 10%
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