There are 120 peach trees in the orchard, and the number of pear trees is three times that of peach trees. How many fewer peach trees are there than pear trees?
果园里有桃树120棵，梨树的棵数是桃树的3倍，桃树比梨树少多少棵？
<gadget id="calculator">120 * 3</gadget>
<output>360</output>

<gadget id="calculator">360 - 120</gadget>
<output>240</output>

<result>240</result>