There are 250 pear trees in the orchard, which are (1/2) peach trees. There are three times as many orange trees as there are pear trees. How many more orange trees than pear trees?
果园里有梨树250棵，是桃树棵树的(1/2)．橘树的棵数是梨树的3倍．橘树比梨树多多少棵？
<gadget id="calculator">250 * 3</gadget>
<output>750</output>

<gadget id="calculator">750 - 250</gadget>
<output>500</output>

<result>500</result>