the sum for 20 + 40 + 70 + 80 = 210
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The sum of 70 + 30 + 1250 + 50 + 100 = 1500
20 + 50 = 70.
-40 + 70 = 30
4 plus 10 plus 16 plus 70 equals 100. To find the sum of this series, simply add all the numbers together.
The sum of these numbers is 563.