SOLUTION: Mike is 18 years old and his grandmother is 66 years old. How many years ago was the grandmother 9 times as old as Mike?

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Question 665258: Mike is 18 years old and his grandmother is 66 years old. How many years ago was the grandmother 9 times as old as Mike?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
The difference in their ages will always be +66+-+18+=+48+ years
If Mike's age is +m+ and Grandmother's age is +9m+,
then +9m+-+m+=+48+
+8m+=+48+
+m+=+6+
Mike was 6 years old 12 years ago since +18+-+12+=+6+