A mason fixed black tiles of square shape around a square room. There are 21 titles on each side of room. How many titles did he need together? A) 55 B) 75 C) 80 D) None of these Related MCQs: A mason fixed black tiles square shape around a square room. There are 21 tiles on each side of a room. How many tiles did he need altogether? How many square meters are in one square km? Which set of hybrid orbital has a square planar shape? Black gold is an oil; Black diamond is ……?