document.write( "Question 320713: jerry was 1/3 as young as his granpa 15 years ago. if the sum of their ages is 110, how old is his grandpa? \n" ); document.write( "

Algebra.Com's Answer #229674 by Fombitz(32388) $\"\"$ $\"About$

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Let Jerry's age be $\"J\"$ , Grandpa's $\"G\"$ .
\n" ); document.write( "Fifteen years ago, Jerry was $\"J-15\"$ , Grandpa was $\"G-15\"$ .
\n" ); document.write( " $\"J-15=%281%2F3%29%28G-15%29\"$
\n" ); document.write( " $\"3J-45=G-15\"$
\n" ); document.write( "1. $\"3J=G%2B30\"$
\n" ); document.write( "Then also,
\n" ); document.write( " $\"G%2BJ=110\"$
\n" ); document.write( " $\"J=110-G\"$
\n" ); document.write( "Substitute this into eq. 1,
\n" ); document.write( " $\"3%28110-G%29=G%2B30\"$
\n" ); document.write( " $\"330-3G=G%2B30\"$
\n" ); document.write( " $\"4G=300\"$
\n" ); document.write( " $\"highlight%28G=75%29\"$
\n" ); document.write( ".
\n" ); document.write( ".
\n" ); document.write( ".
\n" ); document.write( " $\"J=110-G\"$
\n" ); document.write( " $\"J=110-75\"$
\n" ); document.write( " $\"highlight%28J=35%29\"$ \n" ); document.write( "

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