5, (the number 10), 15 (the first number +10), (the number 10), and the next number is the third number +10 or 25.
or you could think of it this way:
5, 10 (+5), 15 (+5), -5 (10)
The pattern is +5, +5, -5, so the next number would be 15, the next 20, and the next 15.
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5+5 = 10 10+5 = 15 15-5 = 15 10+5 = 15
5 10 15 10 5
there is not much of a pattern there but i would say 45
15 (1 + 2 + 3 + 4 + 5).
What would be the next number in this series 15 12 13 10 11 8?