There are 40 red and black balls, of which red balls account for 62.5%, how many more red balls than black balls?
红黑球共40个，其中红球占62.5%，红球比黑球多多少个？
<gadget id="calculator">62.5 / 100</gadget>
<output>0.625</output>

<gadget id="calculator">1 - 0.625</gadget>
<output>0.375</output>

<gadget id="calculator">0.625 - 0.375</gadget>
<output>0.25</output>

<gadget id="calculator">40 * 0.25</gadget>
<output>10</output>

<result>10</result>