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) (Show Source): You can put this solution on YOUR website!
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
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