Uncle Li has an orchard with an area of 4.5 hectares, in which (2/5) are grapefruits. Ask: How many hectares are grapefruits grown in?
李叔叔有一片面积为4.5公顷的果园，其中(2/5)种柚子，问：种柚子的面积为多少公顷？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">4.5 * (2/5)</gadget>
<output>1.8</output>

<result>1.8</result>