How many squares are needed to form a square from rectangles with a length of 20 cm and a width of 12 cm?
用长20厘米、宽12厘米的长方形拼成一个正方形，至少需要正方形多少个．
<gadget id="calculator">2 * 2 * 3 * 5</gadget>
<output>60</output>

<gadget id="calculator">60 / 12</gadget>
<output>5</output>

<gadget id="calculator">60 / 20</gadget>
<output>3</output>

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

<result>15</result>