A steel pipe, cut off the full length (3/4), there are 3 meters left, how many meters is this steel pipe? Column: how much.
一根钢管，截去全长的(3/4)，还剩3米，这根钢管长多少米？列式：多少．
<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">3 / (1/4)</gadget>
<output>12</output>

<result>12</result>