A mason fixed black tiles of square shape around a square room. There are 21 titles on each side of the room. How many titles did he need together?

A) 55

B) 75

C) 80

D) None of these

Answer:

None of these

Step-by-step explanation:

Number of tiles on 1 side of the room= 21 tiles

Since the room is a square all its sides are equal.

Therefore, the number of tiles he needs altogether = 21 × 4 (number of sides in a square)

= 84

Since no option has *84*

Therefore, the answer is None of these