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

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 15a+20(30-a) ≥479 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        15 * a + 20 * ( 30 - a ) ≥479         (1)

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    From inequality(1)：
         a ≤ 121/5

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    The final solution set is :
         a ≤ 121/5
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 15a+20(30-a) ≤502 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        15 * a + 20 * ( 30 - a ) ≤502         (1)

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    From inequality(1)：
         a ≥ 98/5

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    The final solution set is :
         a ≥ 98/5

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