In Uncle Wang's orchard, pear trees accounted for 25%, apple trees accounted for 40%, and there were 300 more apple trees than pear trees. How many pear trees are there in Uncle Wang's orchard?
王大伯的果园里梨树占25%，苹果树占40%，苹果树比梨树多300棵．王大伯的果园里共有多少棵梨树？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(2/5) - (1/4)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">300 / (3/20)</gadget>
<output>2_000</output>

<gadget id="calculator">2_000 * (1/4)</gadget>
<output>500</output>

<result>500</result>