section of road is repaired in three days, 25% of the total length is repaired on the first day, and the same amount is repaired on the second and third days. It is known that the first day is 50 meters less than the third day. How many meters is the total length of this road?
三天修完一段路，第一天修全长的25%，第二、三两天修的同样多，已知第一天比第三天少修50米，这段路全长多少米？
<gadget id="calculator">25 / 100</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">(3/4) / 2</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(3/8) - (1/4)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">50 / (1/8)</gadget>
<output>400</output>

<result>400</result>