document.write( "Question 726847: five years ago i was 5 times older than my son, in 8 years time i will be 3 times older than my son. how old am i today? \n" ); document.write( "

Algebra.Com's Answer #444857 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+a\"$ = my age today
\n" ); document.write( "Let $\"+b+\"$ = my Son's age today
\n" ); document.write( "given:
\n" ); document.write( "(1) $\"+a+-+5+=+5%2A%28+b+-+5+%29+\"$
\n" ); document.write( "(2) $\"+a+%2B+8+=+3%2A%28+b+%2B+8+%29+\"$
\n" ); document.write( "-----------------------
\n" ); document.write( "(1) $\"+a+-+5+=+5b+-+25+\"$
\n" ); document.write( "(1) $\"+a+-+5b+=+-20+\"$
\n" ); document.write( "and
\n" ); document.write( "(2) $\"+a+%2B+8+=+3b+%2B+24+\"$
\n" ); document.write( "(2) $\"+a+-+3b+=+16+\"$
\n" ); document.write( "------------------
\n" ); document.write( "Subtract (2) from (1)
\n" ); document.write( "(1) $\"+a+-+5b+=+-20+\"$
\n" ); document.write( "(2) $\"+-a+%2B+3b+=+-16+\"$
\n" ); document.write( " $\"+-2b+=+-36+%7D%7D%0D%0A%7B%7B%7B+b+=+18+\"$
\n" ); document.write( "and
\n" ); document.write( "(2) $\"+a+-+3b+=+16+\"$
\n" ); document.write( "(2) $\"+a+-+3%2A18+=+16+\"$
\n" ); document.write( "(2) $\"+a+=+16+%2B+54+\"$
\n" ); document.write( "(2) $\"+a+=+70+\"$
\n" ); document.write( "The Father is 70
\n" ); document.write( "check:
\n" ); document.write( "(1) $\"+a+-+5+=+5%2A%28+b+-+5+%29+\"$
\n" ); document.write( "(1) $\"+70+-+5+=+5%2A%28+18+-+5+%29+\"$
\n" ); document.write( "(1) $\"+65+=+5%2A13+\"$
\n" ); document.write( "(1) $\"+65+=+65+\"$
\n" ); document.write( "OK \n" ); document.write( "

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