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    What percentage of area is shaded? 【查看更多】

     

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    计算题
    1. What percentage of area is shaded?

    Answer: _                                                          .
    2. If a group of 6 people have an average age of 21,  and each person is half the age of the next person,
        what are the ages of the 6 people?
    Answer: _                                                           .

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