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

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

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    From inequality(1)：
         n < 15/4
    From inequality(2)：
         n ＞ 5/4

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    From inequalities (1) and (2)
         5/4 < n < 15/4     (3)

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    The final solution set is :
         5/4 < n < 15/4

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