A piece of rectangular paper with a length of 20cm and a width of 16cm, how many pieces of paper are needed to form a square?
一张长方形纸，长20cm，宽16cm，要用这样的纸拼成一个正方形，至少需要多少张？
<gadget id="calculator">5 / 20</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">16 * (1/4)</gadget>
<output>4</output>

<gadget id="calculator">5 / 16</gadget>
<output>5/16 = around 0.3125</output>

<gadget id="calculator">16 * (5/16)</gadget>
<output>5</output>

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

<result>20</result>