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1. 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 chess board ?

Solution:
Area of each square :
=(40064)cm2=6.25cm2
Side of each small square :
=6.25cm=2.5cm
Since there are 8 squares along each side of the chess board, we have :
Side = [(8 × 2.5) + 6] cm
        = 26 cm

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