document.write( "Question 665959: John is 25 years younger than his father. The sum of their ages is 53. What is Johns age?\r
\n" ); document.write( "\n" ); document.write( "the choices are (1)39 (2)28 (3)25 (4)14
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Algebra.Com's Answer #414184 by ReadingBoosters(3246)\"\" \"About 
You can put this solution on YOUR website!
Establish the equation
\n" ); document.write( "x = y - 25
\n" ); document.write( "x+y = 53
\n" ); document.write( "...
\n" ); document.write( "Substitute x in the second equation
\n" ); document.write( "...
\n" ); document.write( "y-25+y = 53
\n" ); document.write( "2y -25 = 53
\n" ); document.write( "...
\n" ); document.write( "Isloate y
\n" ); document.write( "2y = 53 + 25
\n" ); document.write( "2y = 78
\n" ); document.write( "...
\n" ); document.write( "Divide both sides by 2
\n" ); document.write( "\"highlight%28y+=+39%29\" years old for father
\n" ); document.write( "...
\n" ); document.write( "Rearrange the first equation as y = x + 25 and substitute into the second equation.
\n" ); document.write( "x + x + 25 = 53
\n" ); document.write( "2x + 25 = 53
\n" ); document.write( "Isolate x
\n" ); document.write( "2x = 53 - 25
\n" ); document.write( "2x = 28
\n" ); document.write( "Divide both sides by 2
\n" ); document.write( "\"highlight%28x+=+14%29\" years old for John
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\n" ); document.write( "Delighted to help
\n" ); document.write( "-Reading Boosters
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