A rope is used up to 12 meters on the first day, half of it is used up on the second day and the remaining half is 25 meters, and there are 6 meters left in the end. How long is the rope originally?
一根绳子第一天用去12米，第二天用去剩下的一半还多25米，最后还剩6米，这根绳子原来长多少米？
<gadget id="calculator">25 + 6</gadget>
<output>31</output>

<gadget id="calculator">31 * 2</gadget>
<output>62</output>

<gadget id="calculator">62 + 12</gadget>
<output>74</output>

<result>74</result>