The area of a parallelogram is 5m**2, if its base and height are doubled, what is the area of the obtained parallelogram in m**2?
一个平行四边形的面积是5m**2，如果把它的底和高都扩大到原来的2倍，得到的平行四边形的面积是多少m**2．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<result>20</result>