Agricultural Engineering > GATE 2020 > Leveling
The underside beam of a railway bridge, marked as permanent Bench Mark (BM) with Reduced Level (RL) of 85.168 m, is taken as reference for leveling operation. The Back Sight (BS) on the staff held vertically inverted to the BM is 3.645 m. For the Fore Sight (FS) of 1.523 m at a point in the construction site, the RL or elevation in m is _______.
Correct : 80
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