If it takes 6 minutes to saw a stick into 4 pieces, how many minutes will it take to saw the stick into 7 pieces?
将一根木棒锯成4段需要6分钟，则将这根木棒锯成7段，需要多少分钟．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

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

<gadget id="calculator">7 - 1</gadget>
<output>6</output>

<gadget id="calculator">2 * 6</gadget>
<output>12</output>

<result>12</result>