SOLUTION: Sana is senior to Mona by 18 years. After 6 years Sana will be twice as old as Mona. Find Mona's present age.

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Question 1086312: Sana is senior to Mona by 18 years. After 6 years Sana will be twice as old as Mona. Find Mona's present age.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
S=M%2B18
In 6 years,
S%2B6=2%28M%2B6%29
S%2B6=2M%2B12
S-2M=6
Substituting,
M%2B18-2M=6
-M=-12
Solve for M, then use either equation to solve for S.