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Missing proportion 15/5 = 20/n
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Missing proportion 15/5 = 20/n

User Neuraleptic
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(15)/(5) = (20)/(n) \\(3)/(1) = (20)/(n) \\20 * 1 = 3 * n \\(20)/(3) = (3n)/(3) \\6(2)/(3) = n
User Dorian Gray
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