The area of a parallelogram is 20 square decimeters, if the base is enlarged to 3 times of the original, and the height is reduced to (1/3) of the original, what is its area in square decimeters?
一个平行四边形的面积是20平方分米，若底扩大到原来的3倍，高缩小到原来的(1/3)，它的面积是多少平方分米．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">3 * (1/3)</gadget>
<output>1</output>

<gadget id="calculator">20 * 1</gadget>
<output>20</output>

<result>20</result>