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Q: What The sum of two numbers is 15. Twice one number equals three times the other.Find the numbers.?

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No.

Twice. a*a is a squared.

It does not mean anything at all. "Twice a number" is only one number while "the difference" must refer to two numbers, not just one.

It's a square number. Square numbers have a factor pair that is the same number twice. When listed, that number occurs once.