SOLUTION: Mike is three times as old as his little sister mary. in four years, he will be twice as old as mary. how old is mary?

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Question 1074147: Mike is three times as old as his little sister mary. in four years, he will be twice as old as mary. how old is mary?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
Let m represent marys' age. Then Mike would be 3m. So:
3m+4=2(m+4)
3m+4=2m+8
m=4
Mary is 4; Mike is 12. ☺☺☺☺