A rope is 25 meters long, how many meters are cut off for the first time, and 3 meters are cut off for the second time, and 3 meters are left in the end.
一根绳子长25米，第一次剪去多少米，第二次又剪去3米，最后还剩下3米．
<gadget id="calculator">25 - 3 - 3</gadget>
<output>19</output>

<result>19</result>