Records show that 7% of all college students are foreign students who also smoke. It is also known that 25% of all foreign college students smoke. What percent of the students at this university are foreign?
Let C = number of college students
Let Fs = number of foreign students who smoke
Let F = number of foreign students
7%C = Fs and 25%F = Fs
7%C = 25%F
.07C = 0.25F
F = .07/0.25C = 0.28C
So, 28% of the students are foreign
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