The little rabbit picked mushrooms. He could pick 36 mushrooms a day in sunny days, but he could only pick 24 mushrooms in rainy days. He picked a total of 288 mushrooms in a few days, with an average of 32 mushrooms a day. How many of these days were rainy days?
小兔子采蘑菇，晴天每天能采36只，雨天每天只能采24只，它一连几天共采了288只蘑菇，平均每天采32只，这些天中有多少天是雨天．
<gadget id="calculator">288 / 32</gadget>
<output>9</output>

<gadget id="calculator">36 * 9</gadget>
<output>324</output>

<gadget id="calculator">324 - 288</gadget>
<output>36</output>

<gadget id="calculator">36 - 24</gadget>
<output>12</output>

<gadget id="calculator">36 / 12</gadget>
<output>3</output>

<result>3</result>