Overview: 1 questions will be solved this time.Among them
           ☆1 inequalities

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 7000 <= 80a+50(100-a) <= 7200 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        7000 <= 80 * a + 50 * ( 100 - a )         (1)
         80 * a + 50 * ( 100 - a ) <= 7200         (2)

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    From inequality(1)：
         a ≥ 200/3
    From inequality(2)：
         a ≤ 220/3

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    From inequalities (1) and (2)
         200/3 ≤ a ≤ 220/3    (3)

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    The final solution set is :
         200/3 ≤ a ≤ 220/3

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