5, 10 and 15. 20 itself IS a multiple but, strictly speaking, is not between.
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The integral multiples are 5, 10, 15, 20, 25, 30, 35, 40, and 45.
There are 5 multiples of 9. There are 4 multiples of 12. There is 1 number that is a multiple of both, 36.
-15
They are 10 and 20
20