SOLUTION: Mary is n years old. How old will she be in 7 year?s How old was she 8 years ago?

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Question 505837: Mary is n years old. How old will she be in 7 year?s How old was she 8 years ago?
Answer by Maths68(1474) About Me  (Show Source):
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Present age of Mary = n
In 7 years means we have to add 7 to her present age
In 7 years she will be = n+7 years old
8 years ago means we have to subtract 8 from her present age
8 years ago she was = n-8