7. A certain class has twice as many boys as girls. All the boys have dark hair, but only half of the girls have dark hair. Five girls have fair hair. How many students are there in the class?
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Students surveyed boys and girls separately to determine which sport was enjoyed the most. After completing the boy survey, it was determined that for every 3 boys who enjoyed soccer, 5 boys enjoyed basketball. The girl survey had a ratio of the number of
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