A board is 30 decimeters long and 20 decimeters wide, what is its area in square meters?
一块木板长30分米，宽20分米，它的面积是多少平方米．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">30 * (1/5)</gadget>
<output>6</output>

<result>6</result>