If it takes 6 minutes to saw a piece of wood into 3 sections, how many minutes will it take to saw it into 30 sections?
把一根木料锯成3段要6分钟，锯成30段要多少分钟．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">30 - 1</gadget>
<output>29</output>

<gadget id="calculator">3 * 29</gadget>
<output>87</output>

<result>87</result>