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16 July, 20:13

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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  1. 16 July, 20:32
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    400 / 10 = 40.

    40

    X 9

    = 360

    In a group of 400 smokers, about 360 of them started before they reached their 21st birthday.
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