the answer is
drum roll please!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
IT IS 82 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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The LCM of 15 and 20 is 60, which is the multiple of the combined prime factors of both numbers (2 x 2 x 3 x 5).
The least common multiple of the numbers 7, 14, 16 and 20 is 560.
120
As for example the LCM of 15 and 20 is 60
The GCF is 5. The LCM is 60.
The LCM of 5 and 25 is 25. The LCM of 3 and 15 is 15. The LCM of 5-25=-20 and 3-15=-12 is 60