An alarm clock takes 12 seconds to knock 5 times. According to this calculation, how many seconds will it take to knock 10 times.
一个闹钟，敲5下用去12秒，照这样计算，如果敲10下要用多少秒．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

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

<gadget id="calculator">10 - 1</gadget>
<output>9</output>

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

<result>27</result>