An orchard covers an area of 20 hectares, in which (2/5) are planted with apple trees and (1/4) are planted with pear trees, how many hectares are there more apple trees than pear trees?
一个果园占地20公顷，其中的(2/5)种苹果树，(1/4)种梨树，苹果树比梨树多多少公顷？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">20 * (2/5)</gadget>
<output>8</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">20 * (1/4)</gadget>
<output>5</output>

<gadget id="calculator">8 - 5</gadget>
<output>3</output>

<result>3</result>