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Many numbers could have 18 as their GCD (greatest common demoninator/divisor). for instance, 18 and 36 have 18 as their GCD. In general, if you have 2 numbers who's GCD is 18, then those numbers could be expressed as 18x and 18y such that x and y are relatively prime (share no factors, other than 1).

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Q: What two numbers have 18 as there greatest common factor?
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