Overview: 2 questions will be solved this time.Among them
           ☆2 inequalities

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 1000a+1800（20-a） ≤26400 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        1000 * a + 1800 * ( 20 - a ) ≤26400         (1)

---

    From inequality(1)：
         a ≥ 12

---

    The final solution set is :
         a ≥ 12
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 500a+900（20-a） ≥12000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        500 * a + 900 * ( 20 - a ) ≥12000         (1)

---

    From inequality(1)：
         a ≤ 15

---

    The final solution set is :
         a ≤ 15

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