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To complete a two-kilometer road after paving 1789 meters, 211 meters or 21.1 decameters are required.
To find out how many decameters are needed to complete the two-kilometer road after paving 1789 meters, we first convert 2 kilometers to meters, which is 2000 meters. Then, we subtract the paved length from the total length to determine the remaining length.
1789 meters + x = 2000 meters
x = 2000 - 1789 = 211 meters
So, 211 meters or 21.1 decameters are needed to complete the road.
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