How many times does it take to cut a 180 cm long wooden strip into 9 cm long pieces?
一根180厘米长的木条，要锯成9厘米长的小段，需要锯多少次次．
<gadget id="calculator">180 / 9</gadget>
<output>20</output>

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

<result>19</result>