There are 842 willow trees in the park, twice the number of poplar trees. How many willows and poplars are there in the park?
公园里有柳树842棵，是杨树棵数的2倍．公园里柳树和杨树一共有多少棵？
<gadget id="calculator">842 / 2</gadget>
<output>421</output>

<gadget id="calculator">421 + 842</gadget>
<output>1_263</output>

<result>1_263</result>