There are 38 pine trees and 42 willow trees planted in the park. The number of poplar trees is twice the total number of pine trees and willow trees. How many poplar trees are planted in total?
公园里种了38棵松树、42棵柳树，杨树的棵数是松树和柳树的总棵数的2倍，一共种杨树多少棵？
<gadget id="calculator">38 + 42</gadget>
<output>80</output>

<gadget id="calculator">80 * 2</gadget>
<output>160</output>

<result>160</result>