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The question is "What percent of 30 is 20?".

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\"\"                           (Write the proportion)

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\"\"                         (Substitute: 20 for a and 30 for b)

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\"\"       (Multiply each side by 100)

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\"\"                        (Cancel common terms)

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\"\"                               (Simplify: \"\")

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\"\"                               (Write fraction as mixed number)\"\"

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\"\"% of 30 is 20.