Cut a rectangle with a length of 20 cm and a width of 12 cm into squares of the same size and as large an area as possible, and there are no leftovers, at least how many can be cut.
把一张长20厘米、宽12厘米的长方形剪成相同大小、面积尽可能大的正方形，并且没有剩余，至少能剪多少个．
<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>