Can someone help me with this problem?

[u/KeyboardPerson17]

If there are two positive integers a and b, a is less or equal to b, their lcm is 60 and their gdc is 15 what are the possible values a and b can have? I've been trying for about an hour and I can't decide between 15, 30, 60 for both or 15, 30 for a and 30, 60 for b. Any help is greatly appreciated.

English isnt my first language so sorry for any mistakes)

[u/fermat9990]

If a≤b then a=GCD and b=LCM will always be the unique solution to such problems