There are two bundles of ropes with the same length. The first bundle is 27 meters long, and the second bundle is 63 meters long. The remainder of the first bundle is exactly 4 times the length of the second bundle. How many meters is the length of the second bundle?
有两捆绳子它们的长度相等，第一捆用去27米，第二捆用去63米后，第一捆余下的正好是第二捆余下的4倍，第二捆绳子现在长多少米？
<gadget id="calculator">63 - 27</gadget>
<output>36</output>

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">36 / 3</gadget>
<output>12</output>

<result>12</result>