If it takes 4 minutes to saw a piece of wood into 5 sections, how many minutes will it take to saw it into 8 sections?
把一根木头锯成5段需时4分钟，那么锯成8段需时多少分钟
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">4 / 4</gadget>
<output>1</output>

<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">1 * 7</gadget>
<output>7</output>

<result>7</result>