Xiaohua has 42 stamps, and Xiaolin has 15 stamps less than her. How many stamps do they have together?
小华有42枚邮票，小林比她少15枚邮票．两人一共有多少枚邮票．
<gadget id="calculator">42 - 15</gadget>
<output>27</output>

<gadget id="calculator">27 + 42</gadget>
<output>69</output>

<result>69</result>