engineering recuitment GATE CE 2023-24 Test Series Surveying Levelling

The backsight reading on a B.M. = R.L. of 150 m was (-2.250 m). The erected staff reading on the top of workshop floor was 1.450 m. The R.L. of the top of workshop floor is :

1
154.300 m
2
146.300 m
3
150.800 m
4
145.800 m
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