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Danielle and her brother went to the town carnival. Together, they won 15 prizes. Danielle won 9 of them. What fraction did her brother win? If there had been only 10 prizes won, how many would her brother have won if the fractions were equivalent? Can you please show me how to solve the problem?

15 - 9 = 6
Her brother won 6/15 = 2/5

2/5 * 10 = 20/5 = 4

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