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29 August, 14:34

Bob Cooper was born in 1900. By 1930 he had 3 sons, all with the Cooper last name. By

1960 each of Bob's 3 boys had exactly 3 sons of their own. By the end of each 30 year time

period, the pattern of each Cooper boy having exactly 3 sons of their own continued. How

many Cooper sons were born in the 30 year period between 1960 and 1990?

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Answers (1)
  1. 29 August, 14:46
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    Total of 12 cooper kids
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