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If he surveyed 45 students, it is not clear where the 15 came from, and conversely. 3/45 = 12/180 so the answer is 12.

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Q: When Henry surveyed 45 seventh-grade students at random in the school cafeteria he found that 3 out of 15 liked reggae music. Using proportional reasoning about how many of the 180 seventh-grade stude?
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