A person can grow 20 deciduous teeth after birth, which is generally 62.5% of the number of permanent teeth. How many more permanent teeth than baby teeth?
人在出生以后能长出20颗乳牙，一般是恒牙数量的62.5%．恒牙比乳牙多多少颗？
<gadget id="calculator">62.5 / 100</gadget>
<output>0.625</output>

<gadget id="calculator">20 / 0.625</gadget>
<output>32</output>

<gadget id="calculator">32 - 20</gadget>
<output>12</output>

<result>12</result>