The tailor has a piece of material 16 meters long, subtract 2 meters every day, and cut the last piece on the number of days.
裁缝有一段16米长的料子，每天减去2米，第多少天剪完剩下的最后一段．
<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<result>7</result>