The clock strikes 6 times at 6 o'clock, and the ringing is over in 10 seconds. How many seconds does it take to ring 10 times at 10 o'clock?
时钟6时敲响6下，10秒钟敲完．10时敲响10下，需要多少秒．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

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

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

<gadget id="calculator">9 * 2</gadget>
<output>18</output>

<result>18</result>