There is a piece of fabric 18 meters long in the sewing factory, and 2 meters are cut off every day, how many days to cut off the last piece.
缝纫厂有一段18米长的布料，每天剪去2米，多少天剪去最后一段．
<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<gadget id="calculator">9 - 1</gadget>
<output>8</output>

<result>8</result>