Two carpenters were making furniture at Sameer's house. Sameer observed that the carpenter took out his measuring tape and marked 6.85 inches on a wooden plank. By mistake, his colleague cut the plank at 4.75 inches. What is the length of extra wood that needs to be added to it, so as to get the required length?
2.10 inches
Marking on wooden plank = 6.85 inches
Measurement of the wooden plank that is cut = 4.75 inches
Extra wood required =6.85 - 4.75 = 2.10 inches