Total area of 64 small squares of a chessboard is 400 sq. cm. There is 3 cm wide

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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 ?

Options:

A . 17 cm

B . 20 cm

C . 23 cm

D . 26 cm

Answer: Option D

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