The older brother has 18 pencils, the younger brother has 8 pencils, and the elder brother gives the younger brother the same number of pencils.
哥哥有18支铅笔，弟弟有8支铅笔，哥哥给弟弟多少支两人就一样多．
<gadget id="calculator">18 + 8</gadget>
<output>26</output>

<gadget id="calculator">26 / 2</gadget>
<output>13</output>

<gadget id="calculator">18 - 13</gadget>
<output>5</output>

<result>5</result>