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
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14 and 28 are two even numbers between 10 and 30 whose greatest common factor is 14.
7 and 14
The numbers are 5 and 10.
Relatively prime or co-prime.
120 and 144