A truck can transport ore 16 times a day on sunny days and 11 times a day on rainy days. The car was transported 195 times in a few days, with an average of 13 transports per day. How many days are there rainy days?
一辆卡车运矿石，晴天每天可运16次，雨天每天可运11次．这辆车一连几天运了195次，平均每天运13次．这几天中，雨天有多少天？
<gadget id="calculator">195 / 13</gadget>
<output>15</output>

<gadget id="calculator">15 * 16</gadget>
<output>240</output>

<gadget id="calculator">240 - 195</gadget>
<output>45</output>

<gadget id="calculator">16 - 11</gadget>
<output>5</output>

<gadget id="calculator">45 / 5</gadget>
<output>9</output>

<result>9</result>