# Civil Engineering - Surveying - Discussion

Discussion Forum : Surveying - Section 7 (Q.No. 21)
21.
Staff readings on pegs x and y from X station are 1.755 m and 2.850 m, and from station Y on staff head at Y and X are 0.655 m and 1.560 m. If reduced level of X is 105.5 m, the reduced level of Y is
104.0 m
104.5 m
105.0 m
105.5 m
Explanation:
No answer description is available. Let's discuss.
Discussion:
7 comments Page 1 of 1.

Srikanth said:   4 years ago
RL of Y = RL of X + back sight of Y - foresight of Y.

105.5+0.655 - 1.560 = 104.595.
(2)

Vikesh said:   4 years ago
RL of point x + backsight x = height of instrument (105.5 + 1.755 = 107.255).

RL of y = height of instrument - fore sight of y (107.255 - 2.850 = 104.405).
(3)

Pratik said:   5 years ago
By using the formula of reciprocal levelling find the value of h and then we know then.

RL of pt B = RL of pt A - h.
(1)

Anom said:   6 years ago
Subtract the difference of reading either staff x or y with 105.5.
(1)

Dhyey said:   7 years ago
=105.5-(((2.85-1.755) + (1.56-0.655))/2).
=104.5.
(2)

Shilpa sahu said:   8 years ago
Rl - ib = 105.5-(1.56 - 0.655).
(2)

Dhanu said:   9 years ago
How can solve this problem help me?