An iron wire is 34.5 meters long, which is (3/20) longer than a copper wire. How long is this copper wire?
一根铁丝长34.5米，比一根铜丝长(3/20)．这根铜丝长多少米？
<gadget id="calculator">3 / 20</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 + (3/20)</gadget>
<output>23/20 = around 1.15</output>

<gadget id="calculator">34.5 / (23/20)</gadget>
<output>30</output>

<result>30</result>