SOLUTION: find the average of all add numbers below 30?

SOLUTION: find the average of all add numbers below 30?

Algebra.Com

Question 772468: find the average of all add numbers below 30?
Answer by oscargut(2103) (Show Source): You can put this solution on YOUR website!
1+3+5+....29
= 15+(0+2+4+...+28) = 15+2(0+1+2+...+14) = 15+14(15)/2 = 15+7(15) =
8(15) = 120
Answer: 120

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