If a rectangle with a length of 5 cm and a width of 4 cm is enlarged by 5:1, what is the area of the obtained figure in cm**2.
把一个长5cm，宽4cm的长方形按5：1放大，得到的图形的面积是多少cm**2．
<gadget id="calculator">5 * 5</gadget>
<output>25</output>

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

<gadget id="calculator">25 * 20</gadget>
<output>500</output>

<result>500</result>