Subject: General Aptitude · Chapter: Area · Exam: 2006 · Marks: · Difficulty:
Total area of 64 small squares of a chessboard is 400 sq. cm. There is 3 cm wide border around the chess board. What is the length of the side of the chessboard?
(a)17 cm
(b)20 cm
(c)23 cm
(d)26 cm
Answer
Answer (as printed): D
Explanation
Area of each small square $=\left(\frac{400}{64}\right) \mathrm{cm}^{2}=6.25 \mathrm{cm}^{2}$. Side of each small square $=\sqrt{6.25} \mathrm{cm}=2.5 \mathrm{cm}$. Since there are 8 squares along each side of the chessboard, we have : Side $=[(8 \times 2.5)+6] \mathrm{cm}=26 \mathrm{cm}$.