document.write( "Question 624597: Coach Johnson is 10 years older than Tim. When Tim started football 3 years ago, Coach Johnson was twice his age. How old is Tim now? \n" ); document.write( "

Algebra.Com's Answer #392903 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
Let $\"+t+\"$ = Tim's age now
\n" ); document.write( "Let $\"+c+\"$ = Coaches age now
\n" ); document.write( " $\"+t+-+3+\"$ = Tim's age 3 years ago
\n" ); document.write( " $\"+c+-+3+\"$ = Coaches age 3 years ago
\n" ); document.write( "given:
\n" ); document.write( "(1) $\"+c+=+t+%2B+10+\"$
\n" ); document.write( "(2) $\"+c+-+3+=+2%2A%28+t+-+3+%29+\"$
\n" ); document.write( "--------------------
\n" ); document.write( "Substitute (1) into (2)
\n" ); document.write( "(2) $\"+t+%2B+10+-+3+=+2%2A%28+t+-+3+%29+\"$
\n" ); document.write( "(2) $\"+t+%2B+7+=+2t+-+6+\"$
\n" ); document.write( "(2) $\"+t+=+7+%2B+6+\"$
\n" ); document.write( "(2) $\"+t+=+13+\"$
\n" ); document.write( "and
\n" ); document.write( "(1) $\"+c+=+t+%2B+10+\"$
\n" ); document.write( "(1) $\"+c+=+13+%2B+10+\"$
\n" ); document.write( "(1) $\"+c+=+23+\"$
\n" ); document.write( "Tim is 13 now
\n" ); document.write( "check answer:
\n" ); document.write( "(2) $\"+c+-+3+=+2%2A%28+t+-+3+%29+\"$
\n" ); document.write( "(2) $\"+23+-+3+=+2%2A%28+13+-+3+%29+\"$
\n" ); document.write( "(2) $\"+20+=+2%2A10+\"$
\n" ); document.write( "(20 $\"+20+=+20+\"$
\n" ); document.write( "OK \n" ); document.write( "

\n" );