It took 12 seconds for a clock to strike 5 times at 5 o'clock. How many seconds does it take for the clock to strike 10 times at 10 o'clock?
一个时钟，5时敲响5下，用了12秒钟．这个时钟10时敲响10下，需要多少秒．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<gadget id="calculator">9 * 3</gadget>
<output>27</output>

<result>27</result>