There are 16 coins of 1 yuan and 5 jiao, worth 10.5 yuan, how many 5 jiao coins are there?
有1元和5角的硬币共16枚，价值10.5元，5角的硬币有多少枚．
<gadget id="calculator">1 * 16</gadget>
<output>16</output>

<gadget id="calculator">16 - 10.5</gadget>
<output>5.5</output>

<gadget id="calculator">1 - 0.5</gadget>
<output>0.5</output>

<gadget id="calculator">5.5 / 0.5</gadget>
<output>11</output>

<result>11</result>