The little squirrel picked 30 pine nuts in sunny days and 20 in rainy days. It picked 240 pine nuts in total for several days, with an average of 24 pine nuts per day. How many sunny days are there these days?
小松鼠采松子，晴天可以采30个，雨天可以采20个，它一连几天共采240个松子，平均每天采24个．这几天中有几个晴天？
<gadget id="calculator">240 / 24</gadget>
<output>10</output>

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

<gadget id="calculator">240 - 200</gadget>
<output>40</output>

<gadget id="calculator">30 - 20</gadget>
<output>10</output>

<gadget id="calculator">40 / 10</gadget>
<output>4</output>

<result>4</result>