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

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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

Answer: D

Source: GMAT Paper Tests
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