There are 840 apple trees and peach trees in the orchard, among which there are 15 rows of apple trees, each with 24 trees. If there are 8 rows of peach trees, how many trees are in each row?
果园里的苹果树和桃树共有840棵，其中苹果树有15行，每行24棵．如果桃树有8行，平均每行多少棵？
<gadget id="calculator">24 * 15</gadget>
<output>360</output>

<gadget id="calculator">840 - 360</gadget>
<output>480</output>

<gadget id="calculator">480 / 8</gadget>
<output>60</output>

<result>60</result>