document.write( "Question 698560: katie is 3 times as old as her son, after fifteen years she will be twice as old as her son. what will be katie age? \n" ); document.write( "

Algebra.Com's Answer #430826 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
Let $\"+k+\"$ = Katies's age now
\n" ); document.write( "Let $\"+s+\"$ = Son's age now
\n" ); document.write( " $\"+k+%2B+15+\"$ = Katie's age in 15 yrs
\n" ); document.write( " $\"+s+%2B+15+\"$ = Son's age in 15 yrs
\n" ); document.write( "------------------------
\n" ); document.write( "given:
\n" ); document.write( "(1) $\"+k+=+3s+\"$
\n" ); document.write( "(2) $\"+k+%2B+15+=+2%2A%28+s+%2B+15+%29+\"$
\n" ); document.write( "-------------------------
\n" ); document.write( "Substitute (1) into (2)
\n" ); document.write( "(2) $\"+3s+%2B+15+=+2%2A%28+s+%2B+15+%29+\"$
\n" ); document.write( "(2) $\"+3s+%2B+15+=+2s+%2B+30+\"$
\n" ); document.write( "(2) $\"+s+=+30+-+15+\"$
\n" ); document.write( "(2) $\"+s+=+15+\"$
\n" ); document.write( "and
\n" ); document.write( "(1) $\"+k+=+3s+\"$
\n" ); document.write( "(1) $\"+k+=+3%2A15+\"$
\n" ); document.write( "(1) $\"+k+=+45+\"$
\n" ); document.write( "Katie is 45, and in 15 yrs, she will be 60
\n" ); document.write( "check:
\n" ); document.write( "(2) $\"+k+%2B+15+=+2%2A%28+s+%2B+15+%29+\"$
\n" ); document.write( "(2) $\"+45+%2B+15+=+2%2A%28+15+%2B+15+%29+\"$
\n" ); document.write( "(2) $\"+60+=+2%2A30+\"$
\n" ); document.write( "(2) $\"+60+=+60+\"$
\n" ); document.write( "OK\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

\n" );