\"\"

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The expression is 42\"\" of 150.

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The percent is 0.42 and the whole is 150. You need to find the part.

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Let n represent the part.

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Part = percent\"\"whole

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n = 0.42\"\"150    (Substitute percent = 0.42 and whole = 150) \ \

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n = 63                (Multiply: \"\")\"\"

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63 is 42\"\" of 150.