Mom went on a business trip on May 28 and came back on June 3. How many days did she go on business?
妈妈5月28日出差，6月3日回来，她出差多少天．
<gadget id="calculator">31 - 28</gadget>
<output>3</output>

<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">4 + 2</gadget>
<output>6</output>

<result>6</result>