SOLUTION: Mary is n years old. In 10 yrs how old will Mary be? How old was she 7 years ago?

Question 746929: Mary is n years old. In 10 yrs how old will Mary be? How old was she 7 years ago?
Answer by Chipmonkcheeks(3) (Show Source): You can put this solution on YOUR website!
Lets say Mary is 20 years old. Then 7 years ago she would have been 13 years old
that is

In 10 years time Mary will be 30, that is:

So lets do the same thing but instead of saying Mary is 20 years old, we will say Mary is n years old.
Then 7 years ago Mary would have been years old.
In 10 years time Mary will be years old!
Simplez
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