Xiao Ming's father tied the picked corn cobs with a rope. The first time he used half of the total length and 2 meters more, the second time he used the remaining half 10 meters less, and the third time he used 15 meters. 9 meters, so how many meters is this rope originally?
小明爸爸用一根绳子拴摘回来的玉米棒，第一次用去全长的一半还多2米，第二次用去余下的一半少10米，第三次用去15米，最后还剩9米，那么这根绳子原来有多少米呢？
<gadget id="calculator">15 - 10</gadget>
<output>5</output>

<gadget id="calculator">9 + 5</gadget>
<output>14</output>

<gadget id="calculator">14 * 2</gadget>
<output>28</output>

<gadget id="calculator">28 + 2</gadget>
<output>30</output>

<gadget id="calculator">30 * 2</gadget>
<output>60</output>

<result>60</result>