A and B are two steel pipes of the same length. If A cut (1/5) is connected to the B pipe, then the length of the B pipe is 9 meters. How many meters is the length of pipe B?
甲乙两根同样长钢管，如果把甲截(1/5)接到乙管上，这时乙管长9米．原来乙管长多少米？
<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">9 / (6/5)</gadget>
<output>15/2 = around 7.5</output>

<result>15/2 = around 7.5</result>