Xiaohong bought 20 pencils and gave 8 to her younger sister. What percentage of the remaining pencils was the pencils she bought?
小红买来20支铅笔，给妹妹8支，剩下的铅笔是买来铅笔的几分之几？
<gadget id="calculator">20 - 8</gadget>
<output>12</output>

<gadget id="calculator">12 / 20</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>