There are 23 apple trees and 77 pear trees in the orchard. The total number of apple trees and pear trees is twice that of cherry trees. How many cherry trees are there?
果园里有苹果树23棵，梨树77棵，苹果树和梨树的总数是樱桃树的2倍，樱桃树有多少棵？
<gadget id="calculator">23 + 77</gadget>
<output>100</output>

<gadget id="calculator">100 / 2</gadget>
<output>50</output>

<result>50</result>