The students in the sixth grade of the experimental primary school had military training. They walked 12 kilometers every day on sunny days and 8 kilometers every day on rainy days. They walked a total of 52 kilometers in 5 days. How many days are there rainy days during this period?
实验小学六年级的学生进行军训，晴天每天行12千米，雨天每天行8千米，5天共行了52千米．这期间雨天有几天？
<gadget id="calculator">5 * 12</gadget>
<output>60</output>

<gadget id="calculator">60 - 52</gadget>
<output>8</output>

<gadget id="calculator">12 - 8</gadget>
<output>4</output>

<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<result>2</result>