rope, cut (2/13) meters for the first time, and (5/13) meters for the second time, leaving (5/13) meters. How many meters is this rope originally?
一根绳子，第一次剪去(2/13)米，第二次剪去(5/13)米，还剩(5/13)米．这根绳子原来一共有多少米？
<gadget id="calculator">2 / 13</gadget>
<output>2/13 = around 0.153846</output>

<gadget id="calculator">5 / 13</gadget>
<output>5/13 = around 0.384615</output>

<gadget id="calculator">(2/13) + (5/13) + (5/13)</gadget>
<output>12/13 = around 0.923077</output>

<result>12/13 = around 0.923077</result>