There are 240 peach trees in the orchard, 20% less than pear trees. How many pear trees are there?
果园里有桃树240棵，比梨树少20%，梨树有多少棵？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">240 / (4/5)</gadget>
<output>300</output>

<result>300</result>