SOLUTION: Shawn is twice as old as Zack. Four years from now the sum of their ages will be 23. How old is Shawn?

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Question 1106789: Shawn is twice as old as Zack. Four years from now the sum of their ages will be 23. How old is Shawn?
Answer by josgarithmetic(39627) About Me  (Show Source):
You can put this solution on YOUR website!
x, Shawn
z, Zack
system%28x%2Bz=23-8%2Cx=2z%29
.
.