Xiaoqiang and Xiaogang practiced header shots. Xiaogang scored 18 goals, and Xiaoqiang scored twice as many goals as Xiaogang. How many goals did they score in total?
小强和小刚练习头球射门，小刚射进了18个球，小强射进的球是小刚2倍，他们俩一共射进了多少个球？
<gadget id="calculator">18 * 2</gadget>
<output>36</output>

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

<result>54</result>