The number of peach trees in the orchard is 20% less than that of pear trees, which is exactly 20 fewer. How many pear trees are there in the orchard?
果园里桃树的棵数比梨树少20%，恰好少20棵，果园里梨树有多少棵．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">20 / (1/5)</gadget>
<output>100</output>

<result>100</result>