An engineering team repaired a section of highway on the first day (1/5) of the full length, and on the second day it repaired 30% of the full length, leaving 84 meters to be repaired. How many meters is this road?
某工程队修一段公路第一天修了全长的(1/5)，第二天修了全长的30%，还剩84米没修．求这段公路有多少米？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (1/5) - (3/10)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">84 / (1/2)</gadget>
<output>168</output>

<result>168</result>