box of pencils (less than 20), evenly distributed to 2 children or 5 children, there is no surplus, how many pencils may there be in this box.
一盒铅笔(不足20支)，平均分给2个小朋友或5个小朋友都没有剩余，这盒铅笔可能有多少支．
<gadget id="calculator">2 * 5</gadget>
<output>10</output>

<result>10</result>