There are 24 rows of peach trees and 24 rows of apple trees in the orchard. There are 18 peach trees in each row and 15 apple trees in each row. How many fewer apple trees than peach trees?
果园有桃树和苹果树各24行，桃树每行18棵，苹果树每行15棵，苹果树比桃树少多少棵？
<gadget id="calculator">18 * 24</gadget>
<output>432</output>

<gadget id="calculator">15 * 24</gadget>
<output>360</output>

<gadget id="calculator">432 - 360</gadget>
<output>72</output>

<result>72</result>