Cut a piece of rectangular paper with a length of 20 cm and a width of 12 cm into a square with the same size and as large an area as possible. If there is no paper left, how many pieces can be cut at most?
把一张长20厘米，宽12厘米的长方形纸裁成同样大小、面积尽可能大的正方形，纸没有剩余，最多能裁几个？
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

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

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

<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<result>15</result>