A triangle with a base of 5cm and a height of 3cm is enlarged by 4:1, what is the area of the figure obtained?
一个底5cm，高3cm的三角形按4：1放大，得到图形的面积是多少．
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

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

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">20 * 6</gadget>
<output>120</output>

<result>120</result>