SOLUTION: mary is 12 years old. mary is twice as old as helen was three years ago. how old is helen?
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Question 704330: mary is 12 years old. mary is twice as old as helen was three years ago. how old is helen?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
= Mary's age now
Let = Helen's age now
= Helen's age 3 yrs ago
given:
Helen is 9
-------------
check:
3 yrs ago Helen was 6
Mary is 12. That is twice 6
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