After using up (3/8) of a piece of iron wire, there are still 40 meters left. How many meters is this piece of iron wire originally?
一段铁丝，用掉它的(3/8)后，还剩40米，这段铁丝原有多少米？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 - (3/8)</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">40 / (5/8)</gadget>
<output>64</output>

<result>64</result>