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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 492-42（6-5a）-6.4（30+50a） ≥15 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        492 - 42 * ( 6 - 5 * a ) - 6.4 * ( 30 + 50 * a ) ≥15         (1)

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    From inequality(1)：
         a ≤ 3/10

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    The final solution set is :
         a ≤ 3/10

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