SOLUTION: Mary is now 24 years old and Liza is 12. how many years ago was Mary's age thrice the age of Liza?

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Question 412409: Mary is now 24 years old and Liza is 12. how many years ago was Mary's age thrice the age of Liza?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
Mary 24
Liza 12
x years ago
their ages were
Mary (24-x)
Liza (12-x)
...
(24-x)=3(12-x)
24-x = 36-3x
2x= 12
/2
x= 6 years ago