SOLUTION: Solve for n: 15,21,5,n,17. Mean = 15 how do I solve this without resorting to trial and error?

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Question 444488: Solve for n: 15,21,5,n,17. Mean = 15
how do I solve this without resorting to trial and error?
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
(15+21+5+17+n)/5=15
58+n=15*5
58+n=75
n=75-58
n=17
Mean is the same as average.