A steel pipe cuts off the full length (1/4), and then connects it with 2m, which is exactly 20m. How many meters is the original length of this steel pipe?
一根钢管截去全长的(1/4)，再接上2m，正好是20m，这根钢管原来长多少米？
<gadget id="calculator">20 - 2</gadget>
<output>18</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">18 / (3/4)</gadget>
<output>24</output>

<result>24</result>