Construct a section of road as planned. When (3/4) of the task is completed, due to the use of new equipment, the construction speed has increased by 50%. At the same time, in order to maintain the new equipment, the daily construction time has been reduced (1/4). Results took 70 days to complete the task. Q: How many days was originally planned to complete the project?
按计划修建一段公路，当完成了任务的(3/4)时，由于使用上了新设备，修建速度提高了50%，同时为了维修保养新设备，每天修建时间减少了(1/4)，结果共用70天完成任务．问：原计划多少天完工？
<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">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</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">(3/2) * (3/4)</gadget>
<output>9/8 = around 1.125</output>

<gadget id="calculator">(1/4) / (9/8)</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">(3/4) + (2/9)</gadget>
<output>35/36 = around 0.972222</output>

<gadget id="calculator">70 / (35/36)</gadget>
<output>72</output>

<result>72</result>