Mingming’s family planted 800 apple trees, but 280 fewer pear trees than apple trees. How many pear trees did Mingming’s family plant?
明明家种苹果树800棵，种的梨树比苹果树少280棵，明明家种梨树多少棵？
<gadget id="calculator">800 - 280</gadget>
<output>520</output>

<result>520</result>