document.write( "Question 264795: tHE father said to his son 'if im in your age now your only 3 years old. If you are in my age now, im already 78 years old. how old is the son now? \n" ); document.write( "
Algebra.Com's Answer #194868 by JBarnum(2146)\"\" \"About 
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dads age now=x
\n" ); document.write( "sons age now=y
\n" ); document.write( "x>y
\n" ); document.write( "------
\n" ); document.write( "these are the 3 equations you must find from the problem
\n" ); document.write( "we are looking to find what \"n\" is so we can find out the ages
\n" ); document.write( "\"y=3%2Bn\" Same \"n\" years between \"y\" and 3 (\"n\" didnt start at 0, it started at 3, so you have to add 3 to \"n\" to get \"y\")
\n" ); document.write( "\"x=78-n\" Same \"n\" years between 78 and \"x\"
\n" ); document.write( "\"n=x-y\" \"n\" = the number of years between x and y\r
\n" ); document.write( "\n" ); document.write( "-----
\n" ); document.write( "Use substitution method
\n" ); document.write( "n=x-y
\n" ); document.write( "\"n=%2878-n%29-%283%2Bn%29\"
\n" ); document.write( "\"n=78-n-3-n\"
\n" ); document.write( "\"n=75-2n\"
\n" ); document.write( "\"-75=-3n\"
\n" ); document.write( "\"75=3n\"
\n" ); document.write( "\"%2875%2F3%29=n\"
\n" ); document.write( "\"25=n\"
\n" ); document.write( "-----
\n" ); document.write( "plug the value of \"n\" into the\"x\" and \"y\" equations from above
\n" ); document.write( "\"78-n=x\"
\n" ); document.write( "\"78-25=x\"
\n" ); document.write( "\"53=x\" Dads age now
\n" ); document.write( ".
\n" ); document.write( "\"3%2Bn=y\"
\n" ); document.write( "\"3%2B25=y\"
\n" ); document.write( "\"28=y\" Sons age now
\n" ); document.write( ".
\n" ); document.write( "checking answers:
\n" ); document.write( "n=x-y
\n" ); document.write( "\"n=53-28\"
\n" ); document.write( "\"n=25\"
\n" ); document.write( "
\n" );