15 30 45 60 75
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We can't answer that without knowing the numbers. The first five multiples of 5 are 5, 10, 15, 20 and 25.
The first five multiples of 5 are 5, 10, 15, 20 and 25. For them to be common, they need to be compared to another set of multiples.
30, 60, 90, 120, 150
3, 6, 9, 12, 15 The mean is 9.
They are the first six multiples of 15.