The siblings have a total of 23 balloons, the younger brother has 8, and the older sister has more balloons than the younger brother.
姐弟俩共有23个气球，弟弟有8个，姐姐比弟弟多多少个．
<gadget id="calculator">23 - 8</gadget>
<output>15</output>

<gadget id="calculator">15 - 8</gadget>
<output>7</output>

<result>7</result>