Yes, 10 is a multiple of 20.
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Well, honey, a multiple of 10 that ain't a multiple of 20 is any number that can be divided by 10 but not by 20. So, numbers like 10, 30, 50, or 70 fit the bill. Just remember, if it's divisible by 20, it's out of the running for this little game.
The Least Common Multiple (LCM) for 10 20 4 is 20.
10
20, 40, 60, 80,... take any integer k, and 20k is a multiple of of 10 and 20
Amongst others they can be 2+3+15 = 20 which is a multiple of 10