S is the sum of an arithmetic sequence with n terms:
x_1 + x_2 + x_3 + … x_n-1 + x_n = S
A subsequence that includes only every other term, but still starts at x_1 and finishes at x_n totals 88:
x_1 + x_3 + x_5 + … x_n-2 + x_n = 88
A subsequence that includes only every third term, but still starts at x_1 and finishes at x_n totals 60:
x_1 + x_4 + x_7 + … x_n-3 + x_n = 60
What is the sum of the whole sequence S?
For bonus points if the first term is 0, what is the common difference between consecutive terms?
