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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 1.5(20-a)+1.2（30+1.5a） ≤69 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        1.5 * ( 20 - a ) + 1.2 * ( 30 + 1.5 * a ) ≤69         (1)

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    From inequality(1)：
         a ≤ 10

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    The final solution set is :
         a ≤ 10

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