Use rectangular pieces of paper with a length of 12 cm and a width of 9 cm to form a square. At least how many pieces of this kind of paper should be used.
用长12厘米，宽9厘米的长方形纸片拼成一个正方形，至少要用这种纸片多少张．
<gadget id="calculator">9 / 12</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">2 * 2 * (3/4)</gadget>
<output>3</output>

<gadget id="calculator">9 / 9</gadget>
<output>1</output>

<gadget id="calculator">2 * 2 * 1</gadget>
<output>4</output>

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

<result>12</result>