and B have two wires of the same length. If the B wire is cut off (1/5) and connected to the A wire, the length of the A wire is 30 meters. How long is the original B wire?
甲乙两根同样长的电线，如果乙电线截去(1/5)接到甲电线上去，这时甲电线的长度是30米，原来乙电线长多少米．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">30 / (6/5)</gadget>
<output>25</output>

<result>25</result>