The length of a rectangle is 5cm and the width is 4cm. If each side of the rectangle is enlarged by 3:1, what is the area of the enlarged rectangle in cm**2.
一个长方形的长是5cm，宽是4cm，把这个长方形的各边按3：1放大，放大后的长方形的面积是多少cm**2．
<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>