Overview: 2 questions will be solved this time.Among them
           ☆2 inequalities

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 2/5a ≤100-a .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        2 / 5 * a ≤100 - a         (1)

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    From inequality(1)：
         a ≤ 500/7

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    The final solution set is :
         a ≤ 500/7
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 120(100-a)+80a ≤9710 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        120 * ( 100 - a ) + 80 * a ≤9710         (1)

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    From inequality(1)：
         a ≥ 229/4

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    The final solution set is :
         a ≥ 229/4

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