There are 120 pear trees in the orchard, 16 rows of apple trees, and 20 trees in each row, how many more apple trees than pear trees?
果园里有梨树120棵，苹果树有16行，每行有20棵，苹果树比梨树多多少棵？
<gadget id="calculator">20 * 16</gadget>
<output>320</output>

<gadget id="calculator">320 - 120</gadget>
<output>200</output>

<result>200</result>