The average age of a family of 6 members is 28 years.If the age of the youngest member is 7 years,what was the average age of the family at the birth of the youngest member?\nOptions:\n(A) 15\n(B) 18\n(C) 21\n(D) 12\n(E) 19 Think first, then make a decision. Some random thoughts:
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Present age of total members = 6 X 28 = 168\n7 yrs back their ages were = 6 x 7 = 42\nAges at the birth of youngest member = 168 - 42 = 126\nTherefore, avg age at the birth of youngest member = 126/6 = 21. So the answer is (C).
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