The mother squirrel picked 20 pine cones a day in sunny days, but only 10 in rainy days. She picked 120 pine cones in a few days, with an average of 12 pine cones a day. Q: How many rainy days are there in these days?
松鼠妈妈采松果，晴天每天可以采20个，雨天每天只采10个，它一连几天采了120个松果，平均每天采12个．问：这几天中有几个雨天？
<gadget id="calculator">120 / 12</gadget>
<output>10</output>

<gadget id="calculator">20 * 10</gadget>
<output>200</output>

<gadget id="calculator">200 - 120</gadget>
<output>80</output>

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

<gadget id="calculator">80 / 10</gadget>
<output>8</output>

<result>8</result>