If the clock strikes 9 times in 16 seconds, how many seconds does it take to strike 12 times?
时钟16秒敲9下，敲12下要多少秒．
<gadget id="calculator">9 - 1</gadget>
<output>8</output>

<gadget id="calculator">16 / 8</gadget>
<output>2</output>

<gadget id="calculator">12 - 1</gadget>
<output>11</output>

<gadget id="calculator">2 * 11</gadget>
<output>22</output>

<result>22</result>