When a piece of work is completed according to the original plan (1/4), the work efficiency is increased (1/8), and the daily working hours are increased (1/3). As a result, it takes 18 days to complete the work. How many days did you plan to work?
一件工作，按原计划完成(1/4)时，将工效提高(1/8)，每天的工作时间增加(1/3)，结果共用18天完工．原计划工作时间是多少天．
<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">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 + (1/8)</gadget>
<output>9/8 = around 1.125</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 + (1/3)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">(9/8) * (4/3)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(3/4) / (3/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) + (1/4)</gadget>
<output>3/4 = around 0.75</output>

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

<result>24</result>