-5
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-5
-5.The patterns seems to be "+9 +1 -20" repeat.And, 15 - 20 = -5.
add 9 add 1 subtract 20 add 9 add 1
To get the average of 6 -15 -24 3 and -25, add them up and divide by 5. You get -55/5 = -11
6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25