During the summer vacation, Lingling and Lele went to the library to read books. Lingling went there once every two days, and Lele went there once every three days. They met for the first time in the library on August 21, and they will meet again on at least a few days in August.
暑假，玲玲和乐乐到图书馆看书，玲玲2天去一次，乐乐3天去一次．8月21日他俩第1次在图书馆相遇，至少在8月多少日他们俩会再次相遇．
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">21 + 6</gadget>
<output>27</output>

<result>27</result>