SOLUTION: Two sisters are 9 and 5 years old. How many years time will the product of their ages be 221?

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Question 834866: Two sisters are 9 and 5 years old. How many years time will the product of their ages be 221?
Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
Since their ages are presumed to be integers, look at the prime factorization of 221. 221 = 17*13, so it will take 8 years.