Uncle Zhang used (2/3) of the 20 hectares of land to grow roses, of which red roses accounted for (3/5) of the rose planting area. How many hectares of red roses did Uncle Zhang win?
张伯伯把20公顷土地的(2/3)用来种玫瑰，其中红玫瑰占玫瑰种植面积的(3/5)．张伯伯中了多少公顷红玫瑰？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">20 * (2/3) * (3/5)</gadget>
<output>8</output>

<result>8</result>