There are 350 peach trees in the orchard, 50 fewer than twice as many pear trees. How many pear trees are there?
果园里有350棵桃树，比梨树棵树的2倍少50棵．梨树有多少棵？
<gadget id="calculator">350 + 50</gadget>
<output>400</output>

<gadget id="calculator">400 / 2</gadget>
<output>200</output>

<result>200</result>