If a rectangle with a length of 5 cm and a width of 4 cm is enlarged by 3:1, what is the area of the figure obtained in square centimeters?
一个长5厘米、宽4厘米的长方形按3：1放大，得到的图形的面积是多少平方厘米．
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">15 * 12</gadget>
<output>180</output>

<result>180</result>