The wall clock strikes 4 times at 4 o'clock, and it takes 12 seconds to finish, so how many seconds does it take to strike 9 times at 9 o'clock.
挂钟4点钟敲4下，12秒敲完，那么9点钟敲9下，多少秒敲完．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

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

<gadget id="calculator">9 - 1</gadget>
<output>8</output>

<gadget id="calculator">4 * 8</gadget>
<output>32</output>

<result>32</result>