The younger brother got 18 lucky stars, and the older sister got 3 times as much as the younger brother. How many lucky stars did the siblings earn in total?
弟弟折了18个幸运星，姐姐折的是弟弟的3倍．姐弟俩一共折了多少个幸运星？
<gadget id="calculator">18 * 3</gadget>
<output>54</output>

<gadget id="calculator">54 + 18</gadget>
<output>72</output>

<result>72</result>