The mother squirrel picks 20 pine nuts a day on sunny days and 12 on rainy days. After 7 days of picking, there are 44 more pine nuts on sunny days than on rainy days. How many days did it rain?
松鼠妈妈采松子晴天每天采20个，雨天每天采12个，采了7天后，晴天比雨天多44个，这几天中有几天下雨？
<gadget id="calculator">20 * 7</gadget>
<output>140</output>

<gadget id="calculator">140 - 44</gadget>
<output>96</output>

<gadget id="calculator">20 + 12</gadget>
<output>32</output>

<gadget id="calculator">96 / 32</gadget>
<output>3</output>

<result>3</result>