CEMC Pascal, 2002

Algebra Difficulty 3.0 AMC 10/12 Find the answer Canada

A rectangle is divided into four smaller rectangles. The areas of three of these rectangles are 6, 15 and 25, as shown. The area of the shaded rectangle is

(A) $7$ (B) $15$ (C) $12$ (D) $16$ (E) $10$

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