LCM(15, 28) = 420
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1,2,4,7,14,28
14 and 21, and 21 and 28 are the number pairs between 15 and 30 that have 7 as their greatest common factor.
It was 16 for a very long time, but now you have to be 15.
Factors are those numbers which can be evenly divided into a number. The factors of 21 would be 1, 3, 7, 21 The factors of 28 would be 1, 2, 4, 7, 14, 28 The factors of 15 would be 1, 3, 5, 15
No you have to be 15-28 to try out... Srry...