There are 8 pine trees and 40 willow trees in the park. The number of poplar trees is twice the sum of pine trees and willow trees. How many poplar trees are there?
公园里有8棵松树，40棵柳树，杨树的棵树是松树和柳树总和的2倍，有杨树多少棵？
<gadget id="calculator">8 + 40</gadget>
<output>48</output>

<gadget id="calculator">48 * 2</gadget>
<output>96</output>

<result>96</result>