A rectangular wheat field is 40 meters long and long (3/10) wide. What is its area in square meters?
一块长方形麦田，长40米，宽是长的(3/10)，它的面积是多少平方米？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">40 * (3/10) * 40</gadget>
<output>480</output>

<result>480</result>