The school planted trees and planned to plant 80 poplars. The number of willows is 20 times that of poplars. How many willows have been planted?
学校植树，准备种杨树80棵，柳树是杨树的20倍，柳树种了多少棵？
<gadget id="calculator">80 * 20</gadget>
<output>1_600</output>

<result>1_600</result>