It took a little monk 12 minutes to saw a tree trunk into 4 sections, how many minutes would it take to saw a tree trunk into 8 sections?
小和尚用12分钟把一根树干锯成了4段，那么把一根树干锯成8段需要多少分钟．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

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

<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">4 * 7</gadget>
<output>28</output>

<result>28</result>