It takes 42 minutes to saw a piece of wood into 7 sections, and the time for each saw is equal. How many minutes will it take to saw 5 sections?
一根木头锯成7段需要42分钟，每锯一段时间相等，如果锯5段需多少分钟．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

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

<gadget id="calculator">42 / 6</gadget>
<output>7</output>

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

<result>28</result>