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

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 400a+300(15-a) ≤5200 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        400 * a + 300 * ( 15 - a ) ≤5200         (1)

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    From inequality(1)：
         a ≤ 7

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    The final solution set is :
         a ≤ 7
[ 2/2Inequality]
    Assignment:Find the solution set of inequality (5/2)a+2(15-a) ≥32 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 5 / 2 ) * a + 2 * ( 15 - a ) ≥32         (1)

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    From inequality(1)：
         a ≥ 4

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    The final solution set is :
         a ≥ 4

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