7 and 14
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There are several possibilities of pairs of numbers whose greatest common factor is 18. 54 and 198 18 and 126 414 and 846 72 and 1422
14 and 28 are two even numbers between 10 and 30 whose greatest common factor is 14.
The numbers are 5 and 10.
Relatively prime or co-prime.
120 and 144