SOLUTION: Mark is twice as old as Dave. In four years the sum of their ages will be 26. How old is Mark today?

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Question 300087: Mark is twice as old as Dave. In four years the sum of their ages will be 26. How old is Mark today?
Answer by JBarnum(2146) About Me  (Show Source):
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Mark is twice as old as Dave. In four years the sum of their ages will be 26. How old is Mark today?
M=2D
(M+4)+(D+4)=26, M+D+8=26, M+D=18
2D+D=18
3D=18
D=6
M=2(6)
M=12
M=Mark
D=Dave