It takes 6 minutes to saw a piece of wood into three pieces, how many minutes will it take to saw it into 6 pieces?
一段木料，锯成三段需6分钟，如果锯成6段需要多少分钟分钟．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

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

<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<result>15</result>