If there is 120 people, 90 are over the age of 30 and the rest are under the age of 20, if one of these people were picked randomly, what is the probability of them being under the age of 20?

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90 people are over the age of 30; 30 are under 20. So 30/120=1/4 are under 20. Probability of picking someone under the age of 20 is 1/4 or 0.25 or 25%."

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