The sum of two addends and their sum is 258, and one of the addends is twice the other addend, so what is the smaller addend among them?
两个加数与它们的和连加起来和是258，其中一个加数是另一个加数的2倍，那么它们中较小的加数是多少．
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">258 / 2 / 3</gadget>
<output>43</output>

<result>43</result>