document.write( "Question 229370: Today, Mr. D is 21 years younger than his neighbor. 3 years ago, the neighbor was twice as old as Mr. D was back then. Find the neighbor's current age. Please provide a chart or let statement. \n" ); document.write( "
Algebra.Com's Answer #170122 by ankor@dixie-net.com(22740)\"\" \"About 
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Today, Mr. D is 21 years younger than his neighbor. 3 years ago, the neighbor was twice as old as Mr. D was back then. Find the neighbor's current age.
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\n" ); document.write( "Let d = D's present age
\n" ); document.write( "Let n = neighbor's present age
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\n" ); document.write( "\" Mr. D is 21 years younger than his neighbor.\"
\n" ); document.write( "d = n - 21
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\n" ); document.write( "3 years ago, the neighbor was twice as old as Mr. D was back then.
\n" ); document.write( "n - 3 = 2(d - 3)
\n" ); document.write( "n - 3 = 2d - 6
\n" ); document.write( "n = 2d - 6 + 3
\n" ); document.write( "n = 2d - 3
\n" ); document.write( "Replace d with (n-21)
\n" ); document.write( "n = 2(n-21) - 3
\n" ); document.write( "n = 2n - 42 - 3
\n" ); document.write( "n - 2n = -45
\n" ); document.write( "-n = - 45
\n" ); document.write( "n = 45 yrs neighbor's present age
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\n" ); document.write( "See if that flies in the statement (d = 45 - 21 = 24);
\n" ); document.write( "3 years ago, the neighbor was twice as old as Mr. D was back then.
\n" ); document.write( "45 - 3 = 2(24 - 3)
\n" ); document.write( "42 = 2(21)
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