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Mathematics, 08.07.2019 08:00 17795

Approximately 9 out of 10 smokers began smoking before the age of 21. in a group of 400 smokers, about how many of them started before they reached their 21st birthday?

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Approximately 9 out of 10 smokers began smoking before the age of 21. in a group of 400 smokers, abo...
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