Some children play games in groups. For the first time, there are 4 children in each group and 2 are left. In the second group, there are 5 children in each group and 2 children are left. Do you know how many children are at least playing games?
一些小朋友分组做游戏，第一次分组每组4个余下2个，第二次分组每组5个也余2个，你知道最少有多少个小朋友做游戏吗？
<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<gadget id="calculator">20 + 2</gadget>
<output>22</output>

<result>22</result>