The average is 31.5
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The only multiples of 2 are 1 and 2 because it's a prime number, but if you meant first 2 multiples of 20 then it's also 1 and 2.
The first 4 multiples of 10 are: 10, 20, 30, and 40.
15 & 20 have an infinite number of Common Multiples; the first three are 60, 120 and 180.
5 10 15 20
Multiples of what???For example, to get multiples of 20, just start with 20 and add 20 at a time: 20, 40, 60, ...