It takes 5 minutes to saw a piece of wood, and how many minutes to saw it into 8 sections.
一根木料，每锯开一段要5分钟，锯成8段要多少分钟．
<gadget id="calculator">8 - 1</gadget>
<output>7</output>

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

<result>35</result>