The wall clock strikes 6 times at 6 o'clock, and it takes 10 seconds to finish. How many seconds does it take to ring 12 times at 12 o'clock?
挂钟6时敲响了6下，10秒钟敲完．12时敲响12下，需要多少秒．
<gadget id="calculator">12 - 1</gadget>
<output>11</output>

<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">10 / 5</gadget>
<output>2</output>

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

<result>22</result>