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mathstudent55
There are only 5 numbers, so figure out what they are and add them.
Notice that each term is 5 more than the previous one, so add 5 to each term to find out the next term.

7 + 12 + 17 + 22 + 27 = 85

Answer: A. 85
we meet again !...

It's an arithmetic series.
The sum of the first n terms of an arithmetic series:




The sum of the first five terms is 85.