There are 400 apple trees in the orchard. The peach trees are 80% of the apple trees and 40% of the pear trees. How many pear trees are there?
果园有苹果树400棵，桃树是苹果树的80%，相当于梨树的40%，梨树有多少棵？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(4/5) / (2/5)</gadget>
<output>2</output>

<gadget id="calculator">400 * 2</gadget>
<output>800</output>

<result>800</result>