Qiangqiang puts 20 red and yellow balls with the same appearance into the bag, the possibility of him drawing a red ball is (3/5), how many more red balls he puts in than the yellow balls.
强强把红黄共20个外观一样的球放入袋子中，他摸出红球的可能性是(3/5)，他放进的红球比黄球多多少个．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">20 * (3/5)</gadget>
<output>12</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">20 * (2/5)</gadget>
<output>8</output>

<gadget id="calculator">12 - 8</gadget>
<output>4</output>

<result>4</result>