document.write( "Question 445517: The sum of Steve and Tim is 72 years. In 12 years time Steve, the older person, will be 6 times the age that Tim was 21 years ago.\r
\n" ); document.write( "\n" ); document.write( "1.1) What are their present ages?
\n" ); document.write( "1.2) What was the difference between their ages 15 years ago? \n" ); document.write( "

Algebra.Com's Answer #306885 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"s\"$ = Steve's age now
\n" ); document.write( "Let $\"t\"$ = Tin's age now
\n" ); document.write( "given:
\n" ); document.write( "(1) $\"+s+%2B+t+=+72+\"$
\n" ); document.write( "(2) $\"+s+%2B+12+=+6%2A%28+t+-+21%29+\"$
\n" ); document.write( "-------------------
\n" ); document.write( "(1) $\"+s+=+72+-+t+\"$ )
\n" ); document.write( "By substitution:
\n" ); document.write( "(2) $\"+72+-+t+%2B+12+=+6%2A%28+t+-+21%29+\"$
\n" ); document.write( "(2) $\"+72+-+t+%2B+12+=+6t+-+126+\"$
\n" ); document.write( "(2) $\"+7t+=+72+%2B+12+%2B+126+\"$
\n" ); document.write( "(2) $\"+7t+=+210+\"$
\n" ); document.write( " $\"+t+=+30+\"$
\n" ); document.write( "and, since,
\n" ); document.write( "(1) $\"+s+%2B+t+=+72+\"$
\n" ); document.write( "(1) $\"+s+%2B+30+=+72+\"$
\n" ); document.write( "(1) $\"+s+=+42+\"$
\n" ); document.write( "-------------
\n" ); document.write( "(1.1) Steve is 42 and Tim is 30
\n" ); document.write( "(1.2) The difference in their ages never changes,
\n" ); document.write( "so, it was 12 years difference \n" ); document.write( "

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