If it takes 10 minutes to saw a piece of wood into 3 pieces, how many minutes will it take to saw it into 8 pieces?
把一根木材锯成3段需要10分钟，照这样，锯成8段需要多少分钟．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

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

<gadget id="calculator">5 * 7</gadget>
<output>35</output>

<result>35</result>