Mr. Zhang collected 56 stamps, and Mr. Li collected twice as many stamps as Mr. Zhang. How many stamps did they collect together?
张老师收藏邮票56枚，李老师收藏的邮票张数是张老师的2倍，两人一共收集多少张邮票？
<gadget id="calculator">56 * 2</gadget>
<output>112</output>

<gadget id="calculator">112 + 56</gadget>
<output>168</output>

<result>168</result>