The average length of the sides of triangle ABC is 12. What is the perimeter of triangle ABC?\nOptions:\n(A) 4\n(B) 6\n(C) 12\n(D) 24\n(E) 36
Step-by-step reasoning process below:
(E)
(average) = (perimeter)/3;\n12 = (perimeter)/3;\n(perimeter) = 36.

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Thus, the answer is (E)