SOLUTION: The midpoint of xy is z, if xy=3n and xz=n+15, what is yz?

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Question 1107069: The midpoint of xy is z, if xy=3n and xz=n+15, what is yz?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
The midpoint of xy is z, if xy=3n and xz=n+15, what is yz?
:
x------z------y
|-----3n------|
|-n+15-|
:
%283n%29%2F2 = n + 15
3n = 2(n+15)
3n = 2n + 30
3n - 2n = 30
n = 30
therefore
xy = 30 + 15
xy = 45
xy = yz, therefore
yz = 45