A rectangular piece of land is 20 meters long and long (2/5) wide. What is the area of this piece of land in square meters?
一块长方形地，长20米，宽是长的(2/5)，这块地的面积是多少平方米？
<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">20 * 8</gadget>
<output>160</output>

<result>160</result>