A Mason fixed black tiles of square shape around a square room. There are 21 tiles on each side of the room. How many tiles did he need altogether...?
(A) 88
(B) 76
(C) 80
(D) None of these
✅ Correct Answer:80
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A Mason fixed black tiles of square shape around a square room. There are 21 tiles on each side of the room. How many tiles did he need altogether...?