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3 November, 22:29

Fourteen-year-old Shirley collects one coin from every country that she visits. If she currently has collected 18 coins and wants to accumulate at least 82 coins by the time she is 30, what is the minimum number of countries she should visit on average each year until then?

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  1. 3 November, 23:55
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    30 years - 14 years = 16 years

    82 coins - 18 coins = 64 coins

    64/16 = 4 coins per year or 4 countries per year

    Shirley should visit about 4 countries per year.
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