Bunuel wrote:

A square board that has an area of 25 square inches is to be cut into pieces, each of which is a square with sides of length 1, 2 or 3 inches What is the least number of such square pieces into which the board can be cut?

(A) 5

(B) 6

(C) 7

(D) 8

(E) 9

Area of Square with side 5 = 25

Area of Square with side 3 = 9

Area of Square with side 2 = 4

Area of Square with side 1 = 1

only one square with side 3 can come (area covered = 9, area left 16)

3 squares with side 2 can come = (area covered = 12 + 9, area left 4)

4 squares with side 1 will come

D

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