Use a piece of red ribbon for the children to make red ribbons of the same length. If you fold the long ribbon into 50 percent, on one section, after the part measured for the children, there is 5cm left. If you fold the long ribbon into 60 percent, then On one of the sections, after measuring the part for the children, there is 2cm left. Find the total length of this ribbon.
用一条红丝带给小朋友们做相同长度的红丝带，若把长丝带折成5折，在其中一段上，给小朋友量出的部分后，还剩5cm，若把长丝带折成6折，在其中一段上，给小朋友量出的部分后，还剩2cm，求这条丝带的总长度．
<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<gadget id="calculator">25 - 12</gadget>
<output>13</output>

<gadget id="calculator">5 * 13</gadget>
<output>65</output>

<gadget id="calculator">65 + 25</gadget>
<output>90</output>

<result>90</result>