The little squirrel can pick 20 pine nuts per day on sunny days and 12 per day on rainy days. It was picked for 8 days in a row, and a total of 112 were picked. How many days does it rain?
小松鼠采松子，晴天每天可采20个，雨天每天可采12个．它一连采了8天，共采112个．这几天当中有几天下雨？
<gadget id="calculator">20 * 8</gadget>
<output>160</output>

<gadget id="calculator">160 - 112</gadget>
<output>48</output>

<gadget id="calculator">20 - 12</gadget>
<output>8</output>

<gadget id="calculator">48 / 8</gadget>
<output>6</output>

<result>6</result>