A middle school conducts military training during the summer vacation. It runs 35 kilometers per day on sunny days and 22 kilometers per day on rainy days. It runs a total of 403 kilometers in 13 days. How many days are there sunny days during this period? (column equation)
某中学利用暑假进行军训，晴天每日行35千米，雨天每日行22千米，13天共行403千米，这期间晴天有多少天？(列方程)
<gadget id="calculator">22 * 13</gadget>
<output>286</output>

<gadget id="calculator">403 - 286</gadget>
<output>117</output>

<gadget id="calculator">35 - 22</gadget>
<output>13</output>

<gadget id="calculator">117 / 13</gadget>
<output>9</output>

<result>9</result>