Original Bar Length: Each reinforcement bar is 12,000mm in length.
Lap Length: The lap length for joining two bars is 800mm , 50D for 16mm.
To cut the bars into lengths of 5600mm and 6400mm such that there is no wastage and the lap length between two bars is 800mm.
This suggests that each half can be potentially used, but we need to adjust for lap length.12,000mm / 2 = 6,000mm
For a 12,000mm bar:
5600mm + 6400mm = 12,000mm
Since the lap length is 800mm, when you cut a piece of 5600mm:
5600mm + 800mm = 6400mm
12,000mm - 5600mm = 6400mm
Thus, you successfully achieve cutting lengths of 5600mm and 6400mm from a 12,000mm bar, with a lap length of 800mm, ensuring no wastage.