When a theater troupe goes to perform in other places, it needs to pay 50 yuan for the theater rent for one day off. After deducting the theater rent for one day of performance, the average income can be 300 yuan. The theater troupe rented the theater for 30 days and earned a total of 5,500 yuan. Do you know how many days the troupe performed in total?
一个剧团去外地演出，休息一天就要付出50元的剧场租金，演出一天，扣除剧场租金，平均可以收入300元．这个剧团租用剧场30天，共收入5500元，你知道这个剧团共演出了多少天吗？
<gadget id="calculator">300 * 30</gadget>
<output>9_000</output>

<gadget id="calculator">9_000 - 5_500</gadget>
<output>3_500</output>

<gadget id="calculator">300 + 50</gadget>
<output>350</output>

<gadget id="calculator">3_500 / 350</gadget>
<output>10</output>

<gadget id="calculator">30 - 10</gadget>
<output>20</output>

<result>20</result>