There is an iron wire, 30% of it is used for the first time, more than half (1/4) meter is used for the second time, and (6/25) meter is left in the end. Ask how long the wire was originally.
有一根铁丝，第一次用去它的30%，第二次用去剩下的一半多(1/4)米，最后还剩(6/25)米．问这根铁丝原来长多少米．
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">0.98 / (7/10)</gadget>
<output>1.4</output>

<result>1.4</result>