1.

It is given that (6a2 + 7ab + b2) ∶ (a2 + 3ab + b2) ∶∶ 4 ∶ 1 and (11a2 + 2ac + c2) ∶ (7a2 + 3ac + c2) ∷ 7 ∶ 5. If a + b + c = 66, then what is the value of a? (a, b, c > 0)

A. 12
B. 18
C. 21
D. 36
E. 40
Answer» E. 40


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