document.write( "Question 628569: Three years back the age of father was 24 years more than his son at present the father is 5 times as old as the son.how old will the son be three years from now? \n" ); document.write( "

Algebra.Com's Answer #395732 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+f+\"$ = Father's age now
\n" ); document.write( "Let $\"+s+\"$ = Son's age now
\n" ); document.write( " $\"+f+-+3+\"$ = Father's age 3 years ago
\n" ); document.write( " $\"+s+-+3+\"$ = Son's age 3 years ago
\n" ); document.write( " $\"+s+%2B+3+\"$ = Son's age 3 years from now
\n" ); document.write( "------------
\n" ); document.write( "given:
\n" ); document.write( "(1) $\"+f+-+3+=+s+-+3+%2B+24+\"$
\n" ); document.write( "(2) $\"+f+=+5s+\"$
\n" ); document.write( "------------
\n" ); document.write( "Substitute (2) into (1)
\n" ); document.write( "(1) $\"+5s+-+3+=+s+-+3+%2B+24+\"$
\n" ); document.write( "(1) $\"+4s+-+3+=+-3+%2B+24+\"$
\n" ); document.write( "(1) $\"+4s+=+24+\"$
\n" ); document.write( "(1) $\"+s+=+6+\"$
\n" ); document.write( "and
\n" ); document.write( "(2) $\"+f+=+5s+\"$
\n" ); document.write( "(2) $\"+f+=+30+\"$
\n" ); document.write( "------------
\n" ); document.write( " $\"+s+%2B+3+=+6+%2B+3+\"$
\n" ); document.write( " $\"+s+%2B+3+=+9+\"$
\n" ); document.write( "Three years from now, the Son will be 9
\n" ); document.write( "check:
\n" ); document.write( "(1) $\"+f+-+3+=+s+-+3+%2B+24+\"$
\n" ); document.write( "(1) $\"+30+-+3+=+6+-+3+%2B+24+\"$
\n" ); document.write( "(1) $\"+27+=+3+%2B+24+\"$
\n" ); document.write( "(1) $\"+27+=+27+\"$
\n" ); document.write( "and
\n" ); document.write( "(2) $\"+f+=+5s+\"$
\n" ); document.write( "(2) $\"+30+=+5%2A6+\"$
\n" ); document.write( "(2) $\"+30+=+30+\"$
\n" ); document.write( "OK
\n" ); document.write( " \n" ); document.write( "

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