Qingqing and Mingming have a total of 34 stamps. After Mingming gave Qingqing 13 stamps, the number of stamps is equal. Qingqing originally had fewer stamps than Mingming.
青青和明明共有邮票34张，明明送给青青13张后，两人邮票数相等．青青原来比明明少多少张邮票．
<gadget id="calculator">13 + 13</gadget>
<output>26</output>

<result>26</result>