15 + 13 + 11 = 39
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162
The sum of the numbers 13, 15, and 17 added together is 45. Since each number is repeated five times, you can multiply 45 by 5 to get 225. Therefore, the sum of all the numbers listed is 225.
(-5)+(-8)+(-13)+(-16)+(-8)+11+0 11-16-13-8-8-5 -5-13-16-5 -18-21 -39
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19 + 20 = 210
The answer is 142. Just add all of the numbers together and then you get the answer. Always check your work when you are done. You can use a calculator to do this.