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flgirl2023
Mike’s birthday would be on June 10.

This is because 20 is a multiple of 4, and it’s also a multiple of 10.

4x5=20
10x2=20

Hope this helps!
Multiple of 4 = 4, 8, 12 , 16, 20, 24, 28, 32…
Multiple of 10 = 10, 20, 30, 40 …
The common number between the two multiples and also is within 30 days is 20
Therefore 20 is the answer