An orchard covers an area of 20 hectares, of which (2/5) are planted with apple trees, and the rest are planted with pear trees, how many hectares are planted with pear trees?
一个果园占地20公顷，其中的(2/5)种苹果树，其余的种梨树，梨树种了多少公顷？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">20 * (3/5)</gadget>
<output>12</output>

<result>12</result>