There are 300 poplar trees and pear trees in total. There are 40 fewer poplar trees than pear trees. How many poplar trees are there?
杨树与梨树一共300棵，杨树比梨树少40棵，杨树有多少棵？
<gadget id="calculator">300 - 40</gadget>
<output>260</output>

<gadget id="calculator">260 / 2</gadget>
<output>130</output>

<result>130</result>