Two paper tapes, the longer one is 23cm, the shorter one is 15cm. After cutting the two paper tapes to the same length, among the remaining two paper tapes, the length of the longer paper tape is required to be no less than twice the length of the shorter paper tape, so the cut length is at least how many cm.
两条纸带，较长的一条为23cm，较短的一条为15cm．把两条纸带剪下同样长的一段后，剩下的两条纸带中，要求较长的纸带的长度不少于较短的纸带长度的两倍，那么剪下的长度至少是多少cm．
<result>7</result>