Sisi has a colorful rope. After she folded the rope in half and then in half, she measured 10 centimeters with a ruler. How long is the rope in centimeters before it is folded in half?
思思有一条彩色的绳子，她把绳子对折再对折后，用尺子量的是10厘米．那么没有对折前，绳子长多少厘米．
<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<result>40</result>