It is (17+55)/2 = 36
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The sum of the first ten positive integers is: 55
The sum of the first 10 positive integers 1,2,3,4,5,6,7,8,9 and 10 is 55. The sum of the first 10 negative integers -1,-2,-3,-4,-5,-6,-7,-8,-9 and -10 is -55. The sum of the first 10 positive plus the sum of the first 10 negative integers is 0
Sum of first n integers is n/2 times n + 1 ie 27.5 x 56 which is 1540
Call the small number X and the larger one X+1. Sum of the first and three times the second is 55: X + 3(X+1) = 55; simplify and solve for X: X=13. So the integers are 13 and 14.
Sticking with integers, numbers less than 60 but greater than 55 are 56, 57, 58 and 59.