If it takes 30 minutes to saw a piece of wood into six pieces, how many minutes will it take to saw it into two pieces?
一根木头锯成六段需要30分钟，锯成两段需要多少分钟．
<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">30 / 5</gadget>
<output>6</output>

<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">6 * 1</gadget>
<output>6</output>

<result>6</result>