A and B have two ropes. The length of rope A is 56 meters and the length of rope B is 34 meters. After subtracting the same length from both ropes, the length of rope A is 16 meters less than three times the length of rope B. So, what is the remaining length of rope B?
甲乙两根绳子，甲绳长56米，乙绳长34米，两根绳子都减去同样的长度后，甲绳长比乙绳长的3倍少16米．那么，乙绳所剩下的长度是多少米？
<gadget id="calculator">16 - 34</gadget>
<output>-18</output>

<gadget id="calculator">56 + (-18)</gadget>
<output>38</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">38 / 2</gadget>
<output>19</output>

<result>19</result>