The length of the wood is 10 meters. It takes 4 minutes to saw it into some 2-meter-long pieces. How many minutes will it take in total?
木料长10米，要把它锯成一些2米长的小段，每锯一次需要用4分钟，一共需要多少分钟？
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<result>16</result>