There are two pieces of rope with the same length. The first one is cut off by 21 meters, and the second one is cut off by 13 meters. After cutting off 13 meters, it is three times the length of the first one. How long are the two ropes originally?
有两段一样长的绳子，第一根剪去21米，第二根剪去13米后是第一根剩下的3倍，两根绳子原有多长？
<gadget id="calculator">21 * 3</gadget>
<output>63</output>

<gadget id="calculator">63 - 13</gadget>
<output>50</output>

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

<gadget id="calculator">50 / 2</gadget>
<output>25</output>

<result>25</result>