The two brothers each have some cards. After the elder brother gave the younger brother 18 cards, the younger brother still has 18 cards less than the elder brother. It turns out that the elder brother has more cards than the younger brother.
兄弟俩各有一些卡片，哥哥给弟弟18张后，弟弟还比哥哥少18张．原来哥哥比弟弟多多少张卡片．
<gadget id="calculator">18 * 2</gadget>
<output>36</output>

<gadget id="calculator">36 + 18</gadget>
<output>54</output>

<result>54</result>