Cut a bundle of 40-meter-long rope into 2-meter-long pieces for skipping, and use 1 minute for each cut. Cut section by section, how many minutes will it take to finish cutting this bundle of rope?
一捆40米长的绳子，剪成2米长的小段做跳绳，每剪一次用1分钟．一段一段地剪，剪完这捆绳子共用多少分钟？
<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<gadget id="calculator">1 * 20</gadget>
<output>20</output>

<gadget id="calculator">20 - 1</gadget>
<output>19</output>

<result>19</result>