An orchard covers an area of 20 hectares. (2/5) of them are apple trees. How many hectares are apple trees planted?
一个果园占地20公顷，其中的(2/5)种的苹果树，苹果树种了多少公顷？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

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

<result>8</result>