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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 202 <= 12x+10(20-x) <= 206 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        202 <= 12 * x + 10 * ( 20 - x )         (1)
         12 * x + 10 * ( 20 - x ) <= 206         (2)

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    From inequality(1)：
         x ≥ 1
    From inequality(2)：
         x ≤ 3

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    From inequalities (1) and (2)
         1 ≤ x ≤ 3    (3)

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    The final solution set is :
         1 ≤ x ≤ 3

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