The backsight reading taken on a Bench Mark (B.M.) of Reduced Level (R.L.) = 150 m was -2.250 m (inverted staff). The staff reading taken normally on the top of a workshop floor was 1.450 m. What is the R.L. of the top of the workshop floor?

Two points, A and B, are given. If the Reduced Level (RL) of point A is 100.00 m, find the difference in RL between A and B given that the back sight to A is 2 m and the fore sight to B is 1.5 m.

The Reduced Level (RL) of a floor is 200.49 m. The staff reading taken on the floor is 1.695 m, and the reading taken on the staff held upside down against the bottom of the roof is 3.305 m. Find the total height of the ceiling from the floor.