There are 120 willow trees in the forest park, which is twice the number of poplar trees, and the number of pine trees is four times that of poplar trees. How many pine trees are there in the forest park?
森林公园有柳树120棵，是杨树棵数的2倍，松树的棵树是杨树的4倍，森林公园里有松树多少棵？
<gadget id="calculator">120 / 2</gadget>
<output>60</output>

<gadget id="calculator">60 * 4</gadget>
<output>240</output>

<result>240</result>