There are 40 rows of pear trees in an orchard, and each row has the same number of trees. If you add 8 more lines, it will increase by 192 trees than before. How many pear trees were there in the orchard?
果园里有40行梨树，每行棵树相等．如果再增加8行，就比原来增加了192棵．果园里原来有梨树多少棵？
<gadget id="calculator">192 / 8</gadget>
<output>24</output>

<gadget id="calculator">24 * 40</gadget>
<output>960</output>

<result>960</result>