There are 34 peach trees and 47 pear trees in the orchard. These trees are planted in 9 rows on average. How many trees are planted in each row?
果园里有桃树34棵，梨树47棵，把这些树平均种成9行，每行种几棵？
<gadget id="calculator">34 + 47</gadget>
<output>81</output>

<gadget id="calculator">81 / 9</gadget>
<output>9</output>

<result>9</result>