It takes 9 minutes to saw a log into 4 sections. If it is sawed into 16 sections, how many minutes will it take in total?
将一根圆木锯成4段共用9分钟，如果锯成16段，共需多少分钟．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">9 / 3</gadget>
<output>3</output>

<gadget id="calculator">16 - 1</gadget>
<output>15</output>

<gadget id="calculator">3 * 15</gadget>
<output>45</output>

<result>45</result>