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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 28 <0.5a+1.5(30-a) <30 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        28 <0.5 * a + 1.5 * ( 30 - a )         (1)
        0.5 * a + 1.5 * ( 30 - a ) <30         (2)

---

    From inequality(1)：
         a < 17
    From inequality(2)：
         a ＞ 15

---

    From inequalities (1) and (2)
         15 < a < 17     (3)

---

    The final solution set is :
         15 < a < 17

Your problem has not been solved here? Please take a look at the  hot problems ！