SOLUTION: Akeesh’s age is an odd number less than 30 but greater than 20. The number has only 3 factors. How old is Akeesh?

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Question 322679: Akeesh’s age is an odd number less than 30 but greater than 20. The number has only 3 factors. How old is Akeesh?
Answer by solver91311(24713) About Me  (Show Source):
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This problem can be solved without knowing the fact that Akeesh's age is an odd number. In order for a number to have an odd number of factors, it must be a perfect square. That is because factors must always come in pairs, so for there to be an odd number of factors, one of the pairs must consist of two identical numbers and the product must then be a perfect square. There is only one perfect square in the interval .


John