Question

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?​

Answer 1

The number of Cooper sons born between 1960 and 1990 is 27, following a pattern where each son has exactly three sons.

Step-by-step explanation:

The question involves determining how many Cooper sons were born in the period between 1960 and 1990, given a specific pattern of reproduction where each Cooper son has exactly three sons. In 1930, Bob Cooper had three sons, each of whom had three sons by 1960, making nine grandsons in total. Between 1960 and 1990, these nine grandsons would each have three sons of their own, resulting in 27 great-grandsons. Therefore, the number of Cooper sons born between 1960 and 1990 would be 27.

Answer 2

Total of 12 cooper kids