A rectangular vegetable field is 5 meters long and long (7/10) wide. What is the area of this vegetable field in square meters?
一块长方形菜地，长是5米，宽是长的(7/10)，这块菜地的面积是多少平方米？
<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">5 * (7/10) * 5</gadget>
<output>35/2 = around 17.5</output>

<result>35/2 = around 17.5</result>