If it takes 10 minutes to saw a piece of wood into 3 pieces, how many minutes will it take to saw it into 5 pieces?
把一根木头锯成3段需10分钟，锯成5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">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<result>20</result>