document.write( "Question 746929: Mary is n years old. In 10 yrs how old will Mary be? How old was she 7 years ago? \n" ); document.write( "
Algebra.Com's Answer #454594 by Chipmonkcheeks(3)\"\" \"About 
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Lets say Mary is 20 years old. Then 7 years ago she would have been 13 years old
\n" ); document.write( "that is
\n" ); document.write( "\"+20+-+7+=+13+\"\r
\n" ); document.write( "\n" ); document.write( "In 10 years time Mary will be 30, that is:
\n" ); document.write( "\"20+%2B+10+=+30+\"\r
\n" ); document.write( "\n" ); document.write( "So lets do the same thing but instead of saying Mary is 20 years old, we will say Mary is n years old.
\n" ); document.write( "Then 7 years ago Mary would have been \"n+-+7\" years old.\r
\n" ); document.write( "\n" ); document.write( "In 10 years time Mary will be \"n+%2B+10\" years old!\r
\n" ); document.write( "\n" ); document.write( "Simplez
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