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

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 60-a >= 38 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        60 - a >= 38         (1)

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    From inequality(1)：
         a ≤ 22

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    The final solution set is :
         a ≤ 22
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 135a+180(60-a) <= 9900 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        135 * a + 180 * ( 60 - a ) <= 9900         (1)

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    From inequality(1)：
         a ≥ 20

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    The final solution set is :
         a ≥ 20

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