There is a piece of wood, if it is sawed into short pieces of 0.8 meters long, it needs to be sawed 9 times. Now to saw it into short pieces of 0.4 meters long, how many times does it need to be sawed?
有一段木料，如果把它锯成每段0.8米长的短木料，需要锯9次．现在要把它锯成每段0.4米长的短木料，需要锯几次？
<gadget id="calculator">9 + 1</gadget>
<output>10</output>

<gadget id="calculator">0.8 / 0.4</gadget>
<output>2</output>

<gadget id="calculator">10 * 2</gadget>
<output>20</output>

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

<result>19</result>