A piece of iron wire cuts off (5/7), exactly 25 meters, what is the original length of this iron wire in meters?
一根铁丝截去它的(5/7)，正好截去25米，这根铁丝原长是多少米．
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">25 / (5/7)</gadget>
<output>35</output>

<result>35</result>