Class 1 of the fifth grade planted 25 poplar trees and 3 rows of pine trees, for a total of 61 trees. How many pine trees are there in each row?
五年级一班栽了25棵杨树，还栽了3行松树，一共栽了61棵树．每行松树有多少棵？
<gadget id="calculator">61 - 25</gadget>
<output>36</output>

<gadget id="calculator">36 / 3</gadget>
<output>12</output>

<result>12</result>