Total area of the 64 small squares of aches board is 400cm2. There is 3cm wide border around the chess board. What is the length of each side of the chess board?

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A. 17cm
B. 20cm
C. 23cm
D. 26cm

D. 26cm

Area of each square = (400/64)cm2
Area of each square = 6.25cm2

Side of each small square = √6.25 cm
Side of each small square = 2.5 cm

Since there are 8 squares along each side of the chess board, we have :

Side = [(8 × 2.5) + 6] cm
Side = 26 cm

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