A rectangular vegetable field is 20 meters long and long (3/4) wide, what is its area?
一块长方形菜地，长20米，宽是长的(3/4)，它的面积是多少？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">20 * (3/4)</gadget>
<output>15</output>

<gadget id="calculator">20 * 15</gadget>
<output>300</output>

<result>300</result>