There are 120 peach trees in the orchard, 20 less than the number of pear trees (1/3). How many pear trees are there?
果园里有桃树120棵，比梨树棵数的(1/3)少20棵，梨树有多少棵？
<gadget id="calculator">120 + 20</gadget>
<output>140</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">140 / (1/3)</gadget>
<output>420</output>

<result>420</result>