Lan Lan's mother went to Guangzhou for a business trip on March 24 this year and came back on April 5. How many days did Lan Lan's mother travel?
兰兰的妈妈今年3月24日到广州出差，4月5日回来，兰兰的妈妈一共出差了多少天？
<gadget id="calculator">31 - 24</gadget>
<output>7</output>

<gadget id="calculator">7 + 1</gadget>
<output>8</output>

<gadget id="calculator">8 + 5</gadget>
<output>13</output>

<result>13</result>