The age of the grand lady is between 50-70 where each of her son has as many sons as many brothers he has. The grand lady's age is equal to the number of sons and grand sons. What is the age of the grand lady

• answer 64 is correct.
  
  lets say grandlady has n chlidren so each child will have n-1 children.
  
  so total is n+(n*(n-1)) so substitue 8 in this formula you will get 64.
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