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counting and probability intermediate
Problem
Each of a group of girls is blonde or brunette and is blue eyed of brown eyed. If are blue-eyed blondes, are brunettes, and are brown-eyed, then the number of brown-eyed brunettes is
(A)
(B)
(C)
(D)
(E)
Solution
There are brunettes, so there are blondes. We know there are blue-eyed blondes, so there are brown-eyed blondes. Next, we know that people are brown-eyed, so there are brown-eyed brunettes. The answer is
Final answer
E