A steel pipe, after using up (3/4) of it, there is still 6 meters left, what is the original length of this steel pipe?
一根钢管，用去它的(3/4)后，还剩下6米，这根钢管原来长多少米．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">6 / (1/4)</gadget>
<output>24</output>

<result>24</result>